View 74VHCT245A04_4536846.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

74VHCT245A
OCTAL BUS TRANSCEIVER (3-STATE)
s s
s
s
s
s
s
s
s s
HIGH SPEED: tPD = 4.5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 A (MAX.) at TA=25C COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC(OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.9V (MAX.)
SOP
TSSOP
Table 1: Order Codes
PACKAGE SOP TSSOP T&R 74VHCT245AMTR 74VHCT245ATTR
DESCRIPTION The 74VHCT245A is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. This IC is intended for two-way asynchronous communication between data busses; the
direction of data transmission is determined by DIR input. The enable input G can be used to disable the device so that the busses are effectively isolated. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. All floating bus terminals during High Z State must be held HIGH or LOW.
Figure 1: Pin Connection And IEC Logic Symbols
December 2004
Rev. 4
1/13
74VHCT245A
Figure 2: Input/ Output Equivalent Circuit
Figure 3: Input Equivalent Circuit
Table 2: Pin Description
PIN N 1 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 SYMBOL DIR A1 to A8 B1 to B8 NAME AND FUNCTION Directional Control Data Inputs/Outputs Data Inputs/Outputs
G GND VCC
Enable Input Ground (0V) Positive Supply Voltage
Table 3: Truth Table
INPUTS G L L H
X : Don`t Care Z : High Impedance
FUNCTION OUTPUT DIR L H X A BUS OUTPUT INPUT Z B BUS INPUT OUTPUT Z A=B B=A Z
2/13
74VHCT245A
Table 4: Absolute Maximum Ratings
Symbol VCC VI VI/O VI/O IIK IOK IO Supply Voltage DC Input Voltage (DIR, G) DC BUS I/O Voltage (see note 1) DC BUS I/O Voltage (see note 2) DC Input Diode Current DC Output Diode Current DC Output Current Parameter Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 - 20 20 25 75 -65 to +150 300 Unit V V V V mA mA mA mA C C
ICC or IGND DC VCC or Ground Current Storage Temperature Tstg TL Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied 1) Output in OFF State 2) High or Low State. IO absolute maximum rating must be observed
Table 5: Recommended Operating Conditions
Symbol VCC VI VI/O VI/O Top dt/dv Supply Voltage Input Voltage BUS I/O Voltage (see note 1) BUS I/O Voltage (see note 2) Operating Temperature Input Rise and Fall Time (see note 3) (VCC = 5.0 0.5V) Parameter Value 4.5 to 5.5 0 to 5.5 0 to 5.5 0 to VCC -55 to 125 0 to 20 Unit V V V V C ns/V
1) Output in OFF State 2) High or Low State. IO absolute maximum rating must be observed 3) VIN from 0.8V to 2V
3/13
74VHCT245A
Table 6: DC Specifications
Test Condition Symbol Parameter VCC (V) 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 5.5 0 to 5.5 5.5 5.5 0 IO=-50 A IO=-8 mA IO=50 A IO=8 mA VI = VIH or VIL VO = 0V to 5.5V VI = 5.5V or GND VI = VCC or GND One Input at 3.4V, other input at VCC or GND VOUT = 5.5V TA = 25C Min. 2 0.8 4.4 3.94 0.0 0.1 0.36 0.25 0.1 4 1.35 0.5 4.5 4.4 3.8 0.1 0.44 2.5 1.0 40 1.5 5.0 Typ. Max. Value -40 to 85C Min. 2 0.8 4.4 3.7 0.1 0.55 2.5 1.0 40 1.5 5.0 Max. -55 to 125C Min. 2 0.8 Max. V V V V A A A mA A Unit
VIH VIL VOH VOL IOZ
High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current Additional Worst Case Supply Current Output Leakage Current
II ICC +ICC
IOPD
Table 7: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition Symbol Parameter VCC (*) CL (V) (pF) 5.0 5.0 5.0 5.0 5.0 5.0 15 50 15 50 50 50 RL = 1K RL = 1K TA = 25C Min. Typ. 4.5 5.3 9.0 9.7 10.0 Max. 7.5 8.7 13.8 14.8 15.4 1.0 Value -40 to 85C Min. 1.0 1.0 1.0 1.0 1.0 Max. 8.5 9.5 15.0 16.0 16.5 1.0 -55 to 125C Min. 1.0 1.0 1.0 1.0 1.0 Max. 10.0 11.0 16.0 17.0 17.5 1.0 ns ns ns ns Unit
tPLH tPHL tPZL tPZH tPLZ tPHZ tOSLH tOSHL
Propagation Delay Time Output Enable Time Output Disable Time Output to Output Skew Time (note 1)
(*) Voltage range is 5.0V 0.5V Note 1: Parameter guaranteed by design. tsoLH = |tpLHm - tpLHn|, tsoHL = |tpHLm - tpHLn|
4/13
74VHCT245A
Table 8: Capacitive Characteristics
Test Condition Symbol Parameter TA = 25C Min. CIN CI/O CPD Input Capacitance Bus Input Capacitance Power Dissipation Capacitance (note 1) Typ. 6 8 18 Max. 10 Value -40 to 85C Min. Max. 10 -55 to 125C Min. Max. 10 pF pF pF Unit
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit)
Table 4: DYNAMIC SWITCHING CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 TA = 25C Min. Typ. 0.6 -0.9 CL = 50 pF 2.0 -0.6 V Max. 0.9 Value -40 to 85C Min. Max. -55 to 125C Min. Max. Unit
VOLP VOLV VIHD
VILD
Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3)
5.0
5.0
0.8
1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n-1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.0V. Inputs under test switching: 3.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz.
5/13
74VHCT245A
Figure 5: Test Circuit
TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ
CL =15/ 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 1K or equivalent RT = ZOUT of pulse generator (typically 50)
SWITCH Open VCC GND
Figure 6: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
6/13
74VHCT245A
Figure 7: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
7/13
74VHCT245A
SO-20 MECHANICAL DATA
DIM. A A1 B C D E e H h L k ddd 10.00 0.25 0.4 0 mm. MIN. 2.35 0.1 0.33 0.23 12.60 7.4 1.27 10.65 0.75 1.27 8 0.100 0.394 0.010 0.016 0 TYP MAX. 2.65 0.30 0.51 0.32 13.00 7.6 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 0.050 0.419 0.030 0.050 8 0.004 inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299
0016022D
8/13
74VHCT245A
TSSOP20 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 6.4 6.2 4.3 6.5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 6.6 6.6 4.48 0.002 0.031 0.007 0.004 0.252 0.244 0.169 0.256 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.260 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0087225C
9/13
74VHCT245A
Tape & Reel SO-20 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 10.8 13.2 3.1 3.9 11.9 12.8 20.2 60 30.4 11 13.4 3.3 4.1 12.1 0.425 0.520 0.122 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 1.197 0.433 0.528 0.130 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
10/13
74VHCT245A
Tape & Reel TSSOP20 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.8 6.9 1.7 3.9 11.9 12.8 20.2 60 22.4 7 7.1 1.9 4.1 12.1 0.268 0.272 0.067 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.276 0.280 0.075 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
11/13
74VHCT245A
Table 9: Revision History
Date 16-Dec-2004 Revision 4 Description of Changes Order Codes Revision - pag. 1.
12/13
74VHCT245A
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners (c) 2004 STMicroelectronics - All Rights Reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
13/13

▲Up To Search▲

Price & Availability of 74VHCT245A04

	To Download 74VHCT245A04 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .