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CD74HC640 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. CD74HC640
Description  High Speed CMOS Logic Octal Three-State Bus Transceiver, Inverting
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD74HC640 Datasheet(HTML) 1 Page - Texas Instruments

   
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1
Data sheet acquired from Harris Semiconductor
SCHS192
Features
• Buffered Inputs
• Three-State Outputs
• Applications in Multiple-Data-Bus Architecture
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
Pinout
CD74HC640, CD74HCT640
(PDIP, SOIC)
TOP VIEW
Description
The Harris CD74HC640 and CD74HCT640 silicon-gate
CMOS three-state bidirectional inverting and non-inverting
buffers
are
intended
for
two-way
asynchronous
communication between data buses. They have high drive
current outputs which enable high-speed operation when
driving large bus capacitances. These circuits possess the
low power dissipation of CMOS circuits, and have speeds
comparable to low power Sckottky TTL circuits. They can
drive 15 LSTTL loads. The CD74HC640 and CD74HCT640
are inverting buffers.
Functional Diagram
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
DIR
A0
A1
A2
A3
A4
A6
A5
A7
GND
VCC
B0
B1
B2
OE
B3
B4
B5
B6
B7
OUTPUT ENABLE AND
DIRECTION-SELECT LOGIC
A0
A7
OE
DIR
B0
B7
A1
THRU
A6
B1
THRU
B6
VCC = 20
GND = 10
January 1998
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1998
File Number
1677.1
CD74HC640,
CD74HCT640
High Speed CMOS Logic
Octal Three-State Bus Transceiver, Inverting
[ /Title
(CD74
HC640
,
CD74
HCT64
0)
/Sub-
ject
(High
Speed
CMOS


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