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SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
D D D
Member of the Texas Instruments Widebus TM Family EPICTM (Enhanced-Performance Implanted CMOS) Submicron Process DOCTM (Dynamic Output Control) Circuit Dynamically Changes Output Impedance, Resulting in Noise Reduction Without Speed Degradation
D D D D
Dynamic Drive Capability Is Equivalent to Standard Outputs With IOH and IOL of 24 mA at 2.5-V VCC Overvoltage-Tolerant Inputs/Outputs Allow Mixed-Voltage-Mode Data Communications Ioff Supports Partial-Power-Down Mode Operation Packaged in Plastic Fine-Pitch Ball Grid Array Package
description
A Dynamic Output Control (DOC) circuit is implemented, which, during the transition, initially lowers the output impedance to effectively drive the load and, subsequently, raises the impedance to reduce noise. Figure 1 shows typical VOL vs IOL and VOH vs IOH curves to illustrate the output impedance and drive capability of the circuit. At the beginning of the signal transition, the DOC circuit provides a maximum dynamic drive that is equivalent to a high-drive standard-output device. For more information, refer to the TI application reports, AVC Logic Family Technology and Applications, literature number SCEA006, and Dynamic Output Control (DOCTM) Circuitry Technology and Applications, literature number SCEA009.
3.2 2.8 VOL - Output Voltage - V 2.4 2.0 1.6 VCC = 2.5 V 1.2 VCC = 1.8 V 0.8 0.4 0 17 34 51 68 85 102 119 IOL - Output Current - mA 136 153 170 VCC = 3.3 V TA = 25C Process = Nominal - Output Voltage - V TA = 25C Process = Nominal
2.8 2.4 2.0 1.6 1.2 0.8
VCC = 3.3 V 0.4
VCC = 2.5 V VCC = 1.8 V -32 -16 0
-160 -144 -128 -112 -96 -80 -64 -48 IOH - Output Current - mA
Figure 1. Output Voltage vs Output Current This 32-bit (dual-octal) noninverting bus transceiver is operational at 1.2-V to 3.6-V VCC, but is designed specifically for 1.65-V to 3.6-V VCC operation. The SN74AVC32245 is designed for asynchronous communication between data buses. The control-function implementation minimizes external timing requirements. This device can be used as four 8-bit transceivers, two 16-bit transceivers, or one 32-bit transceiver. It allows data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively isolated. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. DOC, EPIC, and Widebus are trademarks of Texas Instruments Incorporated.
PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice.
Copyright (c) 2000, Texas Instruments Incorporated
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PRODUCT PREVIEW
V
OH
SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
description (continued)
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The SN74AVC32245 is characterized for operation from -40C to 85C.
GKE PACKAGE (TOP VIEW)
6 5 4 3 2 1 AB CDEF GHJ K LMNP RT
PRODUCT PREVIEW
terminal assignments
6 5 4 3 2 1 1A2 1A1 1OE 1DIR 1B1 1B2 A 1A4 1A3 GND GND 1B3 1B4 B 1A6 1A5 VCC VCC 1B5 1B6 C 1A8 1A7 GND GND 1B7 1B8 D 2A2 2A1 GND GND 2B1 2B2 E 2A4 2A3 VCC VCC 2B3 2B4 F 2A6 2A5 GND GND 2B5 2B6 G 2A7 2A8 2OE 2DIR 2B8 2B7 H 3A2 3A1 3OE 3DIR 3B1 3B2 J 3A4 3A3 GND GND 3B3 3B4 K 3A6 3A5 VCC VCC 3B5 3B6 L 3A8 3A7 GND GND 3B7 3B8 M 4A2 4A1 GND GND 4B1 4B2 N 4A4 4A3 VCC VCC 4B3 4B4 P 4A6 4A5 GND GND 4B5 4B6 R 4A7 4A8 4OE 4DIR 4B8 4B7 T
FUNCTION TABLE (each 8-bit transceiver) INPUTS OE L L H DIR L H X OPERATION B data to A bus A data to B bus Isolation
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SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
logic diagram (positive logic)
1DIR A3 2DIR A4 H3
1OE
H4
2OE
1A1
A5
2A1
E5
A2
1B1
E2
2B1
To Seven Other Channels
To Seven Other Channels
3DIR
J3
4DIR J4
T3
3OE
T4
4OE
3A1
J5
4A1
N5
J2
3B1
N2
4B1
To Seven Other Channels
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 4.6 V Input voltage range, VI: Except I/O ports (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 4.6 V I/O ports (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to VCC + 0.5 V Voltage range applied to any output in the high-impedance or power-off state, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 4.6 V Voltage range applied to any output in the high or low state, VO (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to VCC + 0.5 V Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50 mA Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50 mA Continuous output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Continuous current through each VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA Package thermal impedance, JA (see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed. 2. The output positive-voltage rating may be exceeded up to 4.6 V maximum if the output current rating is observed. 3. The package thermal impedance is calculated in accordance with JESD 51.
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PRODUCT PREVIEW
SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
recommended operating conditions (see Note 4)
MIN VCC Supply voltage Operating Data retention only VCC = 1.2 V VCC = 1.4 V to 1.6 V VIH High-level input voltage VCC = 1.65 V to 1.95 V VCC = 2.3 V to 2.7 V VCC = 3 V to 3.6 V VCC = 1.2 V VCC = 1.4 V to 1.6 V VIL Low-level input voltage VCC = 1.65 V to 1.95 V VCC = 2.3 V to 2.7 V VCC = 3 V to 3.6 V 0 Active state 3-state VCC = 1.4 V to 1.6 V VCC = 1.65 V to 1.95 V VCC = 2.3 V to 2.7 V VCC = 3 V to 3.6 V VCC = 1.4 V to 1.6 V VCC = 1.65 V to 1.95 V VCC = 2.3 V to 2.7 V VCC = 3 V to 3.6 V 0 0 1.4 1.2 VCC 0.65 x VCC 0.65 x VCC 1.7 2 GND 0.35 x VCC 0.35 x VCC 0.7 0.8 3.6 VCC 3.6 -2 -4 -8 -12 2 4 8 12 mA mA V V V V MAX 3.6 UNIT V
VI VO
Input voltage Output voltage
PRODUCT PREVIEW
IOHS
Static high level output current high-level
IOLS
Static low-level output current low level
Input transition rise or fall rate VCC = 1.4 V to 3.6 V 5 ns/V TA Operating free-air temperature -40 85 C Dynamic drive capability is equivalent to standard outputs with IOH and IOL of 24 mA at 2.5-V VCC. See Figure 1 for VOL vs IOL and VOH vs IOH characteristics. Refer to the TI application reports, AVC Logic Family Technology and Applications, literature number SCEA006, and Dynamic Output Control (DOCTM) Circuitry Technology and Applications, literature number SCEA009. NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
t/v
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SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS IOHS = -100 A IOHS = -2 mA, VOH IOHS = -4 mA, IOHS = -8 mA, IOHS = -12 mA, IOLS = 100 A VOL IOLS = 2 mA, IOLS = 4 mA, IOLS = 8 mA, IOLS = 12 mA, II Ioff IOZ ICC Ci Cio Control inputs A or B ports orts Control inputs VI = VCC or GND VI or VO = 3.6 V VO = VCC or GND VI = VCC or GND, VI = VCC or GND VO = VCC or GND IO = 0 VCC 1.4 V to 3.6 V 1.4 V 1.65 V 2.3 V 3V 1.4 V to 3.6 V VIL = 0.49 V VIL = 0.57 V VIL = 0.7 V VIL = 0.8 V 1.4 V 1.65 V 2.3 V 3V 3.6 V 0 3.6 V 3.6 V 2.5 V 3.3 V 2.5 V 3.3 V MIN TYP MAX UNIT VCC-0.2 1.05 1.2 1.75 2.3 0.2 0.4 0.45 0.55 0.7 2.5 10 12.5 40 A A A A pF pF F V V
VIH = 0.91 V VIH = 1.07 V VIH = 1.7 V VIH = 2 V
Typical values are measured at TA = 25C. For I/O ports, the parameter IOZ includes the input leakage current.
switching characteristics over recommended operating free-air temperature range (unless otherwise noted) (see Figures 2 through 5)
PARAMETER tpd ten tdis FROM (INPUT) A or B OE OE TO (OUTPUT) B or A A or B A or B VCC = 1.2 V TYP VCC = 1.5 V 0.1 V MIN MAX VCC = 1.8 V 0.15 V MIN MAX VCC = 2.5 V 0.2 V MIN MAX VCC = 3.3 V 0.3 V MIN MAX ns ns ns UNIT
operating characteristics, TA = 25C
PARAMETER Cpd d Power dissipation capacitance Outputs enabled Outputs disabled TEST CONDITIONS CL = 0 0, f = 10 MHz VCC = 1.8 V TYP VCC = 2.5 V TYP VCC = 3.3 V TYP UNIT pF
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PRODUCT PREVIEW
SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
PARAMETER MEASUREMENT INFORMATION VCC = 1.2 V AND 1.5 V 0.1 V
2 x VCC From Output Under Test CL = 15 pF (see Note A) 2 k S1 Open GND 2 k TEST tpd tPLZ/tPZL tPHZ/tPZH S1 Open 2 x VCC GND
LOAD CIRCUIT tw Timing Input tsu VCC VCC/2 0V th VCC VCC/2 VCC/2 0V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Output Control (low-level enabling) tPZL VCC Input VCC/2 tPLH VCC/2 0V tPHL VOH Output VCC/2 VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VCC/2 VOL Output Waveform 2 S1 at GND (see Note B) Output Waveform 1 S1 at 2 x VCC (see Note B) tPZH VCC Input VCC/2 VOLTAGE WAVEFORMS PULSE DURATION VCC/2 0V
PRODUCT PREVIEW
Data Input
VCC VCC/2 VCC/2 0V tPLZ VCC VCC/2 VOL + 0.1 V VOL tPHZ VOH VOH - 0.1 V 0V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES
VCC/2
NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50 , tr 2 ns, tf 2 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd.
Figure 2. Load Circuit and Voltage Waveforms
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SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
PARAMETER MEASUREMENT INFORMATION VCC = 1.8 V 0.15 V
2 x VCC From Output Under Test CL = 30 pF (see Note A) 1 k S1 Open GND 1 k TEST tpd tPLZ/tPZL tPHZ/tPZH S1 Open 2 x VCC GND
LOAD CIRCUIT tw Timing Input tsu Data Input VCC/2 VCC VCC/2 0V th VCC VCC/2 0V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Output Control (low-level enabling) tPZL VCC Input VCC/2 tPLH VCC/2 0V tPHL VOH Output VCC/2 VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VCC/2 VOL Output Waveform 2 S1 at GND (see Note B) Output Waveform 1 S1 at 2 x VCC (see Note B) tPZH VCC Input VCC/2 VOLTAGE WAVEFORMS PULSE DURATION VCC/2 0V
VCC/2
VCC/2 0V tPLZ VCC
VCC/2
VOL + 0.15 V VOL tPHZ VOH VOH - 0.15 V 0V
VCC/2
VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES
NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50 , tr 2 ns, tf 2 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd.
Figure 3. Load Circuit and Voltage Waveforms
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PRODUCT PREVIEW
VCC
SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
PARAMETER MEASUREMENT INFORMATION VCC = 2.5 V 0.2 V
2 x VCC From Output Under Test CL = 30 pF (see Note A) 500 S1 Open GND 500 TEST tpd tPLZ/tPZL tPHZ/tPZH S1 Open 2 x VCC GND
LOAD CIRCUIT tw Timing Input tsu VCC VCC/2 0V th VCC VCC/2 VCC/2 0V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Output Control (low-level enabling) tPZL VCC Input VCC/2 tPLH VCC/2 0V tPHL VOH Output VCC/2 VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VCC/2 VOL Output Waveform 2 S1 at GND (see Note B) Output Waveform 1 S1 at 2 x VCC (see Note B) tPZH VCC Input VCC/2 VOLTAGE WAVEFORMS PULSE DURATION VCC/2 0V
PRODUCT PREVIEW
Data Input
VCC VCC/2 VCC/2 0V tPLZ VCC VCC/2 VOL + 0.15 V VOL tPHZ VOH VOH - 0.15 V 0V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES
VCC/2
NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50 , tr 2 ns, tf 2 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd.
Figure 4. Load Circuit and Voltage Waveforms
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SN74AVC32245 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCES191D - MARCH 1999 - REVISED FEBRUARY 2000
PARAMETER MEASUREMENT INFORMATION VCC = 3.3 V 0.3 V
500 S1 2 x VCC Open GND 500 TEST tpd tPLZ/tPZL tPHZ/tPZH S1 Open 2 x VCC GND
From Output Under Test CL = 30 pF (see Note A)
LOAD CIRCUIT
tw VCC
Timing Input tsu Data Input VCC/2
VCC VCC/2 0V th VCC VCC/2 0V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES
Input
VCC/2
VCC/2 0V
VOLTAGE WAVEFORMS PULSE DURATION
Output Control (low-level enabling) tPZL
VCC VCC/2 VCC/2 0V tPLZ VCC VCC/2 VOL + 0.3 V VOL tPHZ VCC/2 VOH VOH - 0.3 V 0V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES
VCC Input VCC/2 tPLH VCC/2 0V tPHL VOH Output VCC/2 VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VCC/2 VOL
Output Waveform 1 S1 at 2 x VCC (see Note B) tPZH Output Waveform 2 S1 at GND (see Note B)
NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50 , tr 2 ns, tf 2 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd.
Figure 5. Load Circuit and Voltage Waveforms
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PRODUCT PREVIEW
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Copyright (c) 2000, Texas Instruments Incorporated

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