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HD74LVC4245A
Octal Bus Transceiver and 3.3 V to 5 V shifters with 3-state Outputs
REJ03D0378-0100 (Previous ADE-205-683 (Z)) Rev.1.00 Aug. 20, 2004
Description
The HD74LVC4245A has eight bus transceivers with three state outputs in a 24 pin package. When (DIR) is high, data flows from the A inputs to the B outputs, and when (DIR) is low, data flows from the B inputs to the A outputs. A and B bus are separated by making enable input (OE) high level. And this product has two terminals (VCCA, VCCB), VCCA (5V) is connected with control input and A bus side, VCCB (3.3V) connected with B bus side. VCCA and VCCB are isolated. This allows for translation from a 3.3 V to a 5 V environment, and vice versa. Low voltage and high-speed operation is suitable at the battery drive product (note type personal computer) and low power consumption extends the life of a battery for long time operation.
Features
* This product function as level shift transceiver that change VCCA input level to VCCB output level, VCCB input level to VCCA output level by providing different supply voltage to VCCA and VCCB. * This product is able to the power management: Turn on and off the supply on VCCB side with providing the supply of VCCA. (Enable input (OE): High level ) * VCCA = 4.5 V to 5.5 V, VCCB = 2.7 V to 3.6 V * All control input VI (max) = 5.5 V (@VCCA = 0 V to 5.5 V) * All A bus side input outputs VI/O (max) = 5.5 V (@VCCA = 0 V or output off state) * All B bus side input outputs VI/O (max) = 3.6 V (@VCCB = 0 V or output off state) * High output current A bus side : 24 mA (@VCCA = 4.5 V to 5.5 V) B bus side : 12 mA (@VCCB = 2.7 V) 24 mA (@VCCB = 3.0 V to 3.6 V) * Ordering Information
Part Name HD74LVC4245ATEL Package Type TSSOP-24 pin Package Code TTP-24DBV Package Abbreviation T Taping Abbreviation (Quantity) EL (1,000 pcs/reel)
Rev.1.00 Aug. 20, 2004 page 1 of 10
HD74LVC4245A
Function Table
Inputs OE L L H H: High level L: Low level X: Immaterial Z: High impedance DIR L H X Operation B data to A bus A data to B bus Z
Pin Arrangement
VCCA 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND 11 GND 12
24 VCCB 23 VCCB 22 OE 21 B1 20 B2 19 B3 18 B4 17 B5 16 B6 15 B7 14 B8 13 GND
(Top view)
Rev.1.00 Aug. 20, 2004 page 2 of 10
HD74LVC4245A
Absolute Maximum Ratings
(1) For VCCA Item Supply voltage Input voltage*1 Input / output voltage Input diode current Output diode current Output current VCCA, GND current Maximum power dissipation *2 at Ta = 25C (in still air) Storage temperature Notes: Symbol VCCA VI VI/O IIK IOK IO ICCA or IGND PT Tstg Ratings -0.5 to 6.0 -0.5 to 6.0 -0.5 to VCCA+0.5 -0.5 to 6.0 -50 -50 50 50 100 862 -65 to 150 Unit V V V mA mA mA mA mW C Conditions DIR, OE A port output "H" or "L" A port output "Z" or VCCA : OFF VI < 0 VO < 0 VO > VCCA+0.5
TSSOP
The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 1. The input and output voltage ratings may be exceeded even if the input and output clamp-current ratings are observed. 2. The maximum package power dissipation was calculated using a junction temperature of 150C. (2) For VCCB
Item Supply voltage Input / output voltage*1 Input diode current Output diode current Output current VCCB,GND current Maximum power dissipation *2 at Ta = 25C (in still air) Storage temperature Notes:
Symbol VCCB VI/O IIK IOK IO ICCB or IGND PT Tstg
Ratings -0.5 to 4.6 -0.5 to VCCB+0.5 -0.5 to 4.6 -50 -50 50 50 100 862 -65 to 150
Unit V V mA mA mA mA mW C
Conditions B port output "H" or "L" B port output "Z" or VCCB : OFF VI < 0 VO < 0 VO > VCCB+0.5
TSSOP
The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 1. The input and output voltage ratings may be exceeded even if the input and output clamp-current ratings are observed. 2. The maximum package power dissipation was calculated using a junction temperature of 150C.
Rev.1.00 Aug. 20, 2004 page 3 of 10
HD74LVC4245A
Recommended Operating Conditions
(1) For VCCA Item Supply voltage Input / output voltage Symbol VCCA VI VI/O IOH IOL t / v Ta Ratings 4.5 to 5.5 0 to 5.5 0 to VCCA 0 to 5.5 -24 24 10 -40 to 85 Unit V V Conditions DIR, OE A port output "H" or "L" A port output "Z" or VCCA : OFF
Output current Input transition rise or fall time Operating temperature
mA ns / V C
Note: Unused or floating inputs must be held high or low. (2) For VCCB Item Supply voltage Input / output voltage Output current Symbol VCCB VI/O IOH IOL Input transition rise or fall time Operating temperature t / v Ta Ratings 2.7 to 3.6 0 to VCCB 0 to 3.6 -12 -24 12 24 10 -40 to 85 Unit V V mA Conditions B port output "H" or "L" B port output "Z" or VCCB : OFF VCCB = 2.7 V VCCB = 3.0 to 3.6 V VCCB = 2.7 V VCCB = 3.0 to 3.6 V
ns / V C
Note: Unused or floating inputs must be held high or low.
Block Diagram
DIR 2 22 A1 3 21 B1 OE
To seven other channels
Rev.1.00 Aug. 20, 2004 page 4 of 10
HD74LVC4245A
Electrical Characteristics
Item Input voltage Output voltage Symbol VIH VIL VOHA VCCA (V) 4.5 to 5.5 4.5 to 5.5 4.5 to 5.5 4.5 5.5 4.5 to 5.5 4.5 to 5.5 4.5 to 5.5 4.5 to 5.5 4.5 to 5.5 4.5 5.5 4.5 to 5.5 4.5 to 5.5 4.5 to 5.5 5.5 5.5 4.5 to 5.5 0 5.5 VCCB (V) 2.7 to 3.6 2.7 to 3.6 2.7 to 3.6 2.7 to 3.6 2.7 to 3.6 2.7 to 3.6 2.7 3.0 3.0 2.7 to 3.6 2.7 to 3.6 2.7 to 3.6 2.7 to 3.6 2.7 3.0 2.7 to 3.6 2.7 to 3.6 3.6 0 2.7 to 3.6 Min 2 VCCA-0.2 3.7 4.7 VCCB-0.2 2.2 2.4 2 Max 0.8 0.2 0.55 0.55 0.2 0.4 0.55 1 5 5 20 80 Unit V V (Ta = -40 to 85C) Test Conditions
IOH = -100 A IOH = -24 mA IOH = -100 A IOH = -12 mA IOH = -24 mA IOL = 100 A IOL = 24 mA IOL = 100 A IOL = 12 mA IOL = 24 mA Control input A port, VO = VCCA or GND B port, VO = VCCB or GND A port, VI/O = 5.5 V B port, VI/O = 3.6 V B to A, control input =VCCA or GND Bn = VCCB or GND, IO (A port) = 0 A to B, control input =VCCA or GND An = VCCA or GND, IO (B port) = 0 A port or Control input, One input at 3.4 V, Other input at VCCA at GND B port, One input at VCCB-0.6V, Other input at VCCB at GND
VOHB
V
VOLA
V
VOLB
V
Input current Off state output current Output leak current Quiescent supply current
IIN IOZA IOZB IOFF ICCA
A A A A
ICCB
4.5 to 5.5
3.6
50
A
Increase in ICC per input *1
ICCA
5.5
2.7 to 3.6
1.5
mA
ICCB
4.5 to 5.5
2.7 to 3.6
0.5
mA
Notes:
For condition shown as Min or Max, use the appropriate values under recommended operating conditions. 1. This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
Rev.1.00 Aug. 20, 2004 page 5 of 10
HD74LVC4245A
Capacitance
(Ta = 25C) Item Control Input capacitance Input/output capacitance Symbol CIN CI/O VCCA (V) 5 5 VCCB (V) 3.3 3.3 Min Typ 5 11 Max Unit pF pF Test Conditions VI = VCCA or GND A port, VI = VCCA or GND, B port, VI = VCCB or GND
Switching Characteristics
(Ta = -40 to 85C), VCCA = 5.00.5 V, VCCB = 2.7 V to 3.6 V Item Propagation delay time Symbol tPLH tPHL tPLH tPHL tZH tZL tZH tZL tHZ tLZ tHZ tLZ Min 1 1 1 1 1 1 1 1 1 1 1 1 Typ Max 6.7 6.3 5 6.1 8.1 9 9.8 8.8 5.8 7 7.8 7.7 Unit ns Test conditions CL = 50 pF RL = 500 From(Input) To(Output) A B ns CL = 50 pF RL = 500 OE OE ns CL = 50 pF RL = 500 OE OE B A A B A B
Output enable time
Output disable time
Operating Characteristics
Item Power dissipation capacitance Symbol CPD VCCA (V) 5.0 VCCB (V) 3.0 Min Typ 39.5 Max Unit pF Test Conditions f = 10 MHz, CL = 0
Power-up considerations
Level-translation devices offer an opportunity for successful mixed-voltage signal design. A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies caused by improperly biased device pins. Take these precautions to guard against such power-up problems. 1. 2. 3. 4. Connect ground before any supply voltage is applied. Next, power up the control side of the device. (Power up of VCCA is first. Next power up is VCCB.) Tie OE to VCCA with a pullup resistor so that it ramps with VCCA. Depending on the direction of the data path, DIR can be high or low. If DIR high is needed (A data to B bus), ramp it with VCCA. Overwise, keep DIR low.
Rev.1.00 Aug. 20, 2004 page 6 of 10
HD74LVC4245A
Test Circuit
See under table 500 S1 OPEN GND
*1
CL = 50 pF
500
Load circuit for outputs S1 Symbol VCCA = 50.5 V VCCB = 2.7 to 3.6 V A/OE to B t PLH / tPHL t ZH / t HZ t ZL / t LZ OPEN GND 6V B/OE to A OPEN GND 2 x VCCA
Note: 1. CL includes probe and jig capacitance.
Rev.1.00 Aug. 20, 2004 page 7 of 10
HD74LVC4245A Waveforms - 1
tr 90 % Input 10 % t PLH Vref1 90 % Vref1 10 % t PHL V OH Output Vref2 Vref2 V OL VCCA = 50.5 V VCCB = 2.7 to 3.6 V A to B VIH Vref1 Vref2 3.0 V 1.5 V 1.5 V B to A 2.7 V 1.5 V 1/2 VCCA GND tf VIH
Symbol
Rev.1.00 Aug. 20, 2004 page 8 of 10
HD74LVC4245A Waveforms - 2
tf 90 % Output Control Vref1 10 % t ZL 10 % t LZ VOH Waveform - A Vref2 V OL + 0.3 V t ZH t HZ V OH - 0.3 V Vref2 GND V OL V OH tr 90 % Vref1 GND VIH
Waveform - B
Symbol
VCCA = 50.5 V VCCB = 2.7 to 3.6 V OE to B OE to A 3.0 V 1.5 V 1/2 VCCA
VIH Vref1 Vref2
3.0 V 1.5 V 1.5 V
Notes: 1. All input pulses are supplied by generators having the following characteristics : PRR 10 MHz, ZO = 50 , tr 2.5 ns, tf 2.5 ns. 2. Waveform - A is for an output with internal conditions such that the output is low except when disabled by the output control. 3. Waveform - B is for an output with internal conditions such that the output is high except when disabled by the output control. 4. The output are measured one at a time with one transition per measurement.
Rev.1.00 Aug. 20, 2004 page 9 of 10
HD74LVC4245A
Package Dimensions
As of July, 2001
Unit: mm
7.80 8.10 Max 24 13
1
12 0.65 1.0 0.13 M 0.65 Max 6.40 0.20 0 - 8
*0.20 0.05
4.40
*0.15 0.05
1.10 Max
0.10
0.07 +0.03 -0.04
0.50 0.10
*Pd plating
Package Code JEDEC JEITA Mass (reference value)
TTP-24DBV -- -- 0.08 g
Rev.1.00 Aug. 20, 2004 page 10 of 10

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