CD54HC4520 Datasheet, PDF (1/13 Pages) Texas Instruments – High-Speed CMOS Logic Dual Synchronous Counters

Data sheet acquired from Harris Semiconductor
SCHS216D
November 1997 - Revised October 2003
CD74HC4518, CD54HC4520,
CD74HC4520, CD74HCT4520
High-Speed CMOS Logic
Dual Synchronous Counters
[ /Title
(CD74
HC451
8,
CD74
HC452
0,
CD74
HCT45
20)
/Sub-
ject
Features
• Positive or Negative Edge Triggering
• Synchronous Internal Carry Propagation
• 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
having interchangeable CLOCK and ENABLE lines for
incrementing on either the positive-going or the negative-
going transition of CLOCK. The counters are cleared by high
levels on the MASTER RESET lines. The counter can be
cascaded in the ripple mode by connecting Q₃ to the
ENABLE input of the subsequent counter while the CLOCK
input of the latter is held low.
Ordering Information
PART NUMBER
CD54HC4520F3A
CD74HC4518E
CD74HC4520E
CD74HC4520M
CD74HC4520MT
CD74HC4520M96
CD74HCT4520E
CD74HCT4520M
TEMP. RANGE
(^oC)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
PACKAGE
16 Ld CERDIP
16 Ld PDIP
16 Ld PDIP
16 Ld SOIC
16 Ld SOIC
16 Ld SOIC
16 Ld PDIP
16 Ld SOIC
Description
The CD74HC4518 is a dual BCD up-counter. The ’HC4520
and CD74HCT4520 are dual binary up-counters. Each
device consists of two independent internally synchronous
4-stage counters. The counter stages are D-type flip-flops
CD74HCT4520MT
-55 to 125
16 Ld SOIC
CD74HCT4520M96
-55 to 125
16 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel. The suffix T denotes a small-quantity reel
of 250.
Pinout
CD54HC4520
(CERDIP)
CD74HC4518
(PDIP)
CD74HC4520, CD74HCT4520,
(PDIP, SOIC)
TOP VIEW
1CP 1
1E 2
1Q₀ 3
1Q₁ 4
1Q₂ 5
1Q₃ 6
1MR 7
GND 8
16 V_CC
15 2MR
14 2Q₃
13 2Q₂
12 2Q₁
11 2Q₀
10 2E
9 2CP
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
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