CD74HC688,
CD74HCT688
Data sheet acquired from Harris Semiconductor
SCHS196
High Speed CMOS Logic
September 1997
8-Bit Magnitude Comparator
Features
Description
• Cascadable
The Harris CD74HC688 and CD74HCT688 are 8-bit
magnitude comparators designed for use in computer and
logic applications that require the comparison of two 8-bit
binary words. When the compared words are equal the
output (Y) is low and can be used as the enabling input for
the next device in a cascaded application.
• Fanout (Over Temperature Range)
[ /Title
(CD74
HC688
,
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C
• Balanced Propagation Delay and Transition Times
CD74
HCT68
8)
/Sub-
ject
(High
Speed
CMOS
Ordering Information
• Significant Power Reduction Compared to LSTTL
Logic ICs
PKG.
o
PART NUMBER TEMP. RANGE ( C) PACKAGE
NO.
E20.3
E20.3
• HC Types
CD74HC688E
CD74HCT688E
CD74HC688M
CD74HCT688M
CD54HC688
NOTES:
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
20 Ld PDIP
20 Ld PDIP
- 2V to 6V Operation
- High Noise Immunity: N = 30%, N = 30%of V
IL IH CC
at
V
= 5V
20 Ld SOIC M20.3
20 Ld SOIC M20.3
Wafer
CC
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V = 0.8V (Max), V = 2V (Min)
IL
IH
- CMOS Input Compatibility, I ≤ 1µA at V , V
OL OH
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
l
2. Die for this part number is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
Pinout
CD74HC688, CD74HCT688
(PDIP, SOIC)
TOP VIEW
1
2
3
4
5
6
7
8
9
V
Y
E
A0
B0
A1
B1
A2
B2
A3
B3
20
19
CC
18 B7
17 A7
16 B6
15 A6
14 B5
13 A5
12
B4
GND 10
11 A4
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
File Number 1646.1
Copyright © Harris Corporation 1997
1