1
Data sheet acquired from Harris Semiconductor
SCHS196C
Features
• Cascadable
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating T emperature Range . . . -55
o
C to 125
o
C
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N
IL
= 30%, N
IH
= 30%of V
CC
at
V
CC
= 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
IL
= 0.8V (Max), V
IH
= 2V (Min)
- CMOS Input Compatibility, I
l
≤ 1µA at V
OL
, V
OH
Description
The ’HC688 and ’HCT688 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.
Pinout
CD54HC688, CD54HCT688 (CERDIP)
CD74HC688 (PDIP, SOIC, SOP, TSSOP)
CD74HCT688 (PDIP, SOIC)
TOP VIEW
Ordering Information
PART NUMBER TEMP. RANGE (
o
C) PACKAGE
CD54HC688F3A -55 to 125 20 Ld CERDIP
CD54HCT688F3A -55 to 125 20 Ld CERDIP
CD74HC688E -55 to 125 20 Ld PDIP
CD74HC688M -55 to 125 20 Ld SOIC
CD74HC688M96 -55 to 125 20 Ld SOIC
CD74HC688NSR -55 to 125 20 Ld SOP
CD74HC688PWR -55 to 125 20 Ld TSSOP
CD74HC688PWT -55 to 125 20 Ld TSSOP
CD74HCT688E -55 to 125 20 Ld PDIP
CD74HCT688M -55 to 125 20 Ld SOIC
CD74HCT688M96 -55 to 125 20 Ld SOIC
NOTE: When ordering, use the entire part number. The suffixes 96
and R denote tape and reel. The suffix T denotes a small-quantity
reel of 250.
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
E
A0
B0
A1
B1
A2
A3
B2
B3
GND
V
CC
B7
A7
B6
Y
A6
B5
A5
B4
A4
September 1997 - Revised August 2003
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© 2003, Texas Instruments Incorporated
CD54HC688, CD74HC688,
CD54HCT688, CD74HCT688
High-Speed CMOS Logic
8-Bit Magnitude Comparator
/Title
CD74
C688
D74
CT68
)
Sub-
ect
High
peed
MOS
