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ADVANCE INFORMATION
PI74LVC4245A
8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Product Features
* 4.5V to 5.5V on A-port and 2.7V to 3.6V on B-port * Latch-up performance exceeds 200mA Per JESD78 * ESD protection exceeds JESD 22 - 2000V Human-Body Model (A114-B) - 200V Machine Model (A115-A) * Industrial Temperature: -40C to +85C * Available Packages: - 24-pin 173-mil wide plastic TSSOP (L) - 24-pin 150-mil wide plastic QSOP (Q) - 24-pin 300-mil wide plastic SOIC (S)
Product Description
Pericom Semiconductor's PI74LVC series of logic circuits are produced using the Company's advanced submicron CMOS technology, achieving industry leading speed. The PI74LVC4245A is a non-inverting 8-bit Bidirectional Transceiver that uses two separate power supply rails. A-port (VCCA) is set to operate at 5V and B-port (VCCB) is set to operate at 3.3V. This allows for translation from a 3.3V to a 5Venvironment and vice-versa. This tranceiver is designed for asynchronous two-way communication between data buses. The direction control input pin (DIR) determines the dataflow from the A bus to the B bus or from the B bus to the A bus. The output enable (OE) input, when HIGH, disables both A and B ports by placing them in HIGH Z condition.
Logic Block Diagram
DIR 2
22
Product Pin Configuration
OE
(5V) VCCA DIR A1 A2 A3 A4 A5 A6 A7 A8 GND GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCCB (3.3V ) VCCB (3.3V ) OE B1 B2 B3 B4 B5 B6 B7 B8 GND
A1 3
A2 4
A3 5
A4 6
A5
7
21 B1 20 B2 19 18 17 16
B3
B4
B5
B6
A6 8
A7 9
A8 10
15 B7 14 B8
Product Pin Description
Pin Name OE Description 3-State Output Enable Inputs (Active LOW) Direction Control Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs Ground Power
Truth Table(1)
Inputs OE L L H DIR L H X Bus B Data to Bus A Bus A Data to Bus B Z (Isolation)
L = Low Signal Level Z = High Impedance 1
Outputs
DIR Ax Bx GND VCCA,VCCB
Note: 1. H = High Signal Level X = Don't Care or Irrelevant
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08/11/03
ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Supply voltage range, VCCA and VCCB ............................ -0.5V to +7V Input voltage range, VI(2) : I/O ports (A-port) .... -0.5V to VCCA +0.5V I/O ports (B-port) ........... -0.5V to VCCB+0.5V Control Pins ................. -0.5V to VCCA +0.5V Input clamp current, IIK (VI <0)................................................-50mA Output clamp current, IOK (VO <0)...........................................-50mA Continous Output Current IO ..................................................50mA Continous Current through each VCC or GND pin .......................100mA Package thermal impedance, JA(3): package L...................... 84C/W package Q...................... 98C/W package S ...................... 79C/W Storage Temperature range, Tstg ................................-65C to 150C Notes: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. This value is limited to 7V maximum. 3. The package thermal impedance is calculated in accordance with JESD 51.
Recommended Operating Conditions for VCCA = 4.5V to 5.5V(4)
Parameter VCCA VIH VIL VI VO IOH IOL TA Supply Voltage High-Level Input Voltage Low-Level Input Voltage Input Voltage Output Voltage High-Level Output Current Low-Level Output Current Operating Free-Air Temperature -40 0 0 Description Min. 4.5 2 0.8 VCCA VCCA -24 24 85 mA C V Max. 5.5 Units
Notes: 4. All unused inputs of the device must be held at the associated VCC or GND to ensure proper device operation.
Recommended Operating Conditions for VCCB = 2.7V to 3.6V(4)
Parameter VCCB VIH VIL VI VO IOH IOL TA Supply Voltage High-Level Input Voltage Low-Level Input Voltage Input Voltage Output Voltage High-Level Output Current Low-Level Output Current Operating Free-Air Temperature VCCB = 2.7V VCCB = 3V VCCB = 2.7V VCCB = 3V -40 VCCB = 2.7V to 3.6V VCCB = 2.7V to 3.6V 0 0 Description Min. 2.7 2 0.8 VCCB VCCB -12 -24 12 24 85 C mA V Max. 3.6 Units
Notes: 4. All unused inputs of the device must be held at the associated VCC or GND to ensure proper device operation.
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
DC Electrical Characteristics (Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified) A-Port (5V)
Parameters Description Test Conditions IOH = -100A IOH = -24mA IOL = 100A IOL = 24mA VI = VCCA or GND VCCA 4.5V 5.5V 4.5V 5.5V 4.5V 5.5V 4.5V 5.5V 5.5V VCCB 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 0.19 0.19 Min. 4.4 5.4 3.7 4.7 Typ.(5) 4.5 5.5 4.17 5.2 0.1 0.1 0.5 0.5 1 A V Max. Units
VOH
Minimum High Level Output Voltage
VOL
Maximum Low Level Output Voltage Maximum Input Leakage Current (Control Inputs)
II IOZ(6) ICCA ICCA(7) CI CIO
Maximum 3-State Output Leakage Current VO = VCCA or GND (A port) Quiescent VCCA Supply VI = VCCA or GND, Current IO = 0 ICCA per input (A port and Control Inputs) One Input at 3.4V, other inputs at VCCA or GND
5.5V 5.5V 5.5V Open 5V
2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V 0.65 2.4
5 10 1.5
mA
Input Capacitance (ConVI = VCCA or GND trol Inputs) Input/Output Capacitance (A port) VO = VCCA or GND
pF 9.5
Notes: 5. All typical values are measured at VCCA = 5V, TA = 25C 6. For I/O ports, the parameter IOZ includes the input leakage current. 7. This is the increase in supply current for each input that is at one of the specified voltage levels, rather than 0V or the associated VCC.
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
DC Electrical Characteristics (Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified) B-Port (3.3V)
Parameters Description Minimum High Level Output Voltage Maximum Low Level Output Voltage Maximum 3-State Output Leakage Current (B port) Quiescent VCCB Supply Current ICCB per input Input/Output Capacitance (B port) Test Conditions IOH = -100A IOH = -12mA IOH = -24mA IOL = 100A IOL = 12mA IOL = 24mA VO = VCCB or GND VI = VCCB or GND, IO = 0 One Input at VCCB -0.6V, other inputs at VCCB or GND VO = VCCB or GND VOL VCCA 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V 4.5V to 5.5V VCCB 2.7V to 3.6V 2.7V 3V 3V 2.7V to 3.6V 2.7V 3V 3.6V 3.6V 2.7V to 3.6V 3.3V 9.7 0.09 0.18 Min. VCC -0.1 2.2 2.4 2 2.56 2.85 2.70 0.1 0.4 0.5 5 10 50 pF A V Typ. Max. Units
VOH
IOZ(6) ICCB ICCB(7) CIO
Notes: 5. All typical values are measured at VCCB = 3.3V, TA = 25C 6. For I/O ports, the parameter IOZ includes the input leakage current. 7. This is the increase in supply current for each input that is at one of the specified voltage levels, rather than 0V or the associated VCC.
Capacitance (VCCA = 4.5V to 5.5V, VCCB = 2.7V to 3.6V, TA = 25C)
Parameters CPD Description Power Dissipation Capacitance (7) Test Conditions Outputs Enabled Outputs Disabled CL = 0pF, f = 10 MHz Typ. 20 2.3 Units pF
Notes: 7. CPD is defined as the value of the internal equivalent capacitance which is derived from dynamic operating current consumption (ICCD) at no output loading and operating at 50% duty cycle, CPD is related to ICCD dynamic operating current by the expression: ICCD = (CPD)(VCC)(fIN) +(ICC static)
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
AC Electrical Characteristics
Parameters tPHL tPLH tPHL tPLH tPZL tPZH tPZL tPZH tPLZ tPHZ tPLZ tPHZ tSK(O)
(Over Recommended Operating Free-Air Temperature Range unless otherwise noted, See Figure 1 and 2) From (Input) A B OE OE OE OE Output-to-Output Skew(8) To (Output) B A A B A B VCCA =5V 0.5V,VCCB = 2.7V to 3.6V CL = 50pF, RL = 500 Min. 1 1 1 1 1 1 1 1 1 1 1 1 Max. 5.7 5.5 6.1 5.9 8 7.6 8 7.7 6.2 5.8 7 6.8 1.5 ns Units
Note: 8. Skew between any two outputs of the same device, switching in the same direction. Parameter guaranteed by design.
Power- Up Considerations
To avoid excessive supply current, bus contention or oscillation during power-up, the following guidelines should be followed: 1. Connect ground first before any supply voltage is applied. 2. Then Power up VCCA, which is the control side of the device. 3. Ramp OE ahead of or with VCCA to help prevent bus contention 4. Ramp DIR with VCCA if DIR HIGH is needed (A bus to B bus). Otherwise keep DIR LOW.
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
PARAMETER MEASUREMENT INFORMATION FOR B TO A PORT VCCA = 5V 0.5V and VCCB = 2.7V to 3.6V
2xVCCA From Output Under Test CL = 50pF
(See Note A)
500
S1
Open GND
Test tPLH/tPHL tPLZ/tPZL tPHZ/tPZH
S1 Open 2 x VCCA GND
500
Load Circuit
Output Control
3V
Input
3V
1.5V
1.5V
1.5V
tPLH
1.5V
0V
tPHL
tPZL
Output Waveform 1 S1 at 2x VCCA (see Note B) t PZH Output Waveform 2 S1 at GND (see Note B)
50%VCCA
0V
tPLZ
VCCA VOL +0.3V
50% VCCA
Output
VOH
VOL VOH
0V
50% VCCA VOL
tPHZ 50%VCCA
VOH -0.3V
Voltage Waveforms Propagation Delay Times
Voltage Waveforms Enable and Disable Times
Figure 1. Load Circuit and Voltage Waveforms
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 impulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50, tR 2.5ns, tF 2.5ns. D. The outputs are measured one at a time with one transition per measurement.
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
PARAMETER MEASUREMENT INFORMATION FOR A TO B PORT VCCA = 4.5V to 5.5V and VCCB = 2.7V to 3.6V
7V From Output Under Test CL = 50 50pF
(See Note A)
500
S1
Open GND
Test tPLH/tPHL tPLZ/tPZL tPHZ/tPZH
S1 Open 7V GND
500
Load Circuit
3V
Output Control
3V
1.5V
1.5V
Input
1.5V
1.5V
tPZL
Output Waveform 1 S1 at 7V (see Note B) t PZH Output Waveform 2 S1 at GND (see Note B)
1.5V
0V
tPLZ
3.5V VOL +0.3V
0V
tPLH
Output
1.5V
tPHL
VOH
1.5V
VOL VOH
0V
tPHZ 1.5V
VOH -0.3V
VOL
Voltage Waveforms Propagation Delay Times
Voltage Waveforms Enable and Disable Times
Figure 2. Load Circuit and Voltage Waveforms
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 impulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50, tR 2.5ns, tF 2.5ns. D. The outputs are measured one at a time with one transition per measurement.
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Packaging Mechanical: 24-pin TSSOP (L)
24
.169 .177
4.3 4.5
.004 .008
0.09 0.20
1
.303 .311 7.7 7.9
0.45 0.75
.047 1.20 Max
.018 .030
SEATING PLANE
.252 BSC 6.4
.0256 BSC 0.65
.007 .012 0.19 0.30
.002 .006
0.05 0.15
X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS
Packaging Mechanical: 24-pin QSOP (Q)
24
.008 0.20 MIN.
.150 .157
3.81 3.99
.008 .013 0.20 0.33
Guage Plane
.010 0.254
1
.337 .344
Detail A
8.56 8.74
.016 .035 0.41 0.89
.041 1.04 REF
0-6
.033 0.84
.053 .069
1.35 1.75
.015 x 45 0.38
Detail A
SEATING PLANE
.004 0.101 .010 0.254
.007 .010
0.178 0.254
.016 0.406 .050 1.27
.228 .244 5.79 6.20
.025 typical 0.635
.008 0.203 .012 0.305
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
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ADVANCE INFORMATION
PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Packaging Mechanical: 24-pin SOIC (S)
24
.2914 .2992
7.40 7.60
.010 .029
0.254 x 45 0.737
1
.5985 15.20 .6141 15.60
.021 0.533 .031 0.787
0-8
0.41 .016 1.27 .050
.0091 .0125
0.23 0.32
.0926 2.35 .1043 2.65
SEATING PLANE
.394 .419 10.00 10.65
.050 BSC
1.27
.013 .020 0.33 0.51
.0040 .0118
0.10 0.30
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Ordering Information
Ordering Code PI74LVC4245AL PI74LVC4245AQ PI74LVC4245AS Package Code L Q S Package Type 24-pin, 173-mil wide plastic TSSOP 24-pin, 150-mil wide plastic QSOP 24-pin, 300-mil wide plastic SOIC
Notes: 1. Thermal characteristics can be found on the company web site at http://www.pericom.com/packaging/mechanicals.php
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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