CD74HC85 Datasheet, PDF (1/8 Pages) Texas Instruments – High Speed CMOS Logic 4-Bit Magnitude Comparator

Data sheet acquired from Harris Semiconductor
SCHS136
August 1997
CD74HC85,
CD74HCT85
High Speed CMOS Logic
4-Bit Magnitude Comparator
[ /Title
(CD74
HC85,
CD74
HCT85
)
/Sub-
ject
(High
Speed
CMOS
Logic
4-Bit
Magni-
tude
Com-
para-
Features
Description
• Buffered Inputs and Outputs
• Typical Propagation Delay: 13ns (Data to Output at
V_CC = 5V, C_L = 15pF, T_A = 25^oC
• Serial or Parallel Expansion Without External Gating
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• 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
The CD74HC85 and CD74HCT85 are high speed
magnitude comparators that use silicon-gate CMOS
technology to achieve operating speeds similar to LSTTL
with the low power consumption of standard CMOS
integrated circuits.
These 4-bit devices compare two binary, BCD, or other
monotonic codes and present the three possible magnitude
results at the outputs (A > B, A < B, and A = B). The 4-bit
input words are weighted (A0 to A3 and B0 to B3), where A3
and B₃ are the most significant bits.
The devices are expandable without external gating, in both
serial and parallel fashion. The upper part of the truth table
indicates operation using a single device or devices in a
serially expanded application. The parallel expansion
scheme is described by the last three entries in the truth
table.
Ordering Information
PART NUMBER TEMP. RANGE (^oC) PACKAGE
PKG.
NO.
CD74HC85E
-55 to 125
16 Ld PDIP E16.3
CD74HCT85E
-55 to 125
16 Ld PDIP E16.3
CD74HC85M
-55 to 125
16 Ld SOIC M16.15
CD74HCT85M
-55 to 125
16 Ld SOIC M16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
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
CD74HC85, CD74HCT85
(PDIP, SOIC)
TOP VIEW
B3 1
(A < B) IN 2
(A = B) IN 3
(A > B) IN 4
(A > B) OUT 5
(A = B) OUT 6
(A < B) OUT 7
GND 8
16 V_CC
15 A3
14 B2
13 A2
12 A1
11 B1
10 A0
9 B0
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1997
1
File Number 1770.1