CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright © Harris Corporation 1994 1
SEMICONDUCTOR
CD54AC161/3A
CD54ACT161/3A
Synchronous Presettable Binary Counters
Functional Diagram
ACT INPUT LOAD TABLE
INPUT UNIT LOAD (NOTE 1)
Pn 0.13
CP 1
MR, TE 0.83
SPE 0.67
PE 0.5
NOTE:
1. Unit load is ∆ICC limit specified in DC Electrical Specifications
Table, e.g., 2.4mA Max at +25oC.
SPE
CP
MR
PE
TE
9
2
1
7
10
GND = 8
VCC = 16
3456
14
13
12
11
15
Q0
Q1
Q2
Q3
TC
P0 P1 P2 P3
June 1997
File Number 3892
Description
The CD54AC161/3A and CD54ACT161/3A are synchronous
presettable binary counters that utilize the Harris Advanced
CMOS Logic technology. The CD54AC161/3A and
CD54ACT161/3A are asynchronously reset. Counting and
parallel presetting are both accomplished synchronously
with the negative-to-positive transition of the clock.
A LO W le v el on the Synchronous Parallel Enab le input, SPE,
disables the counting operation and allows data at the P0 to
P3 inputs to be loaded into the counter (provided that the
setup and hold requirements for SPE are met).
The counters are reset with a LOW level on the Master
Reset input, MR.
Two count enables , PE and TE, in each counter are pro vided
for n-bit cascading. Reset action occurs regardless of the
level of the SPE, PE, TE and CP inputs.
The look-ahead carry feature simplifies serial cascading of
the counters. Both count enable inputs (PE and TE) must be
HIGH to count. The TE input is gated with the Q outputs of
all four stages so that at the maximum count, the terminal
count (TC) output goes HIGH for one clock period. This TC
pulse is used to enable the next cascaded stage.
The CD54AC161/3A and CD54ACT161/3A are supplied in
16 lead dual-in-line ceramic packages (F suffix).
Absolute Maximum Ratings
DC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6V
DC Input Diode Current, IIK
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, IOK
For VO < -0.5V or VO > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . .±50mA
DC Output Source or Sink Current, Per Output Pin, IO
For VO > -0.5V or VO < VCC + 0.5V. . . . . . . . . . . . . . . . . . . . .±50mA
DC VCC or GND Current, ICC or IGND
For Up to 4 Outputs Per Device, Add ±25mA For Each
Additional Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±100mA
Power Dissipation Per Package, PD
TA = -55oC to +100oC (Package F) . . . . . . . . . . . . . . . . . . 500mW
TA = +100oC to +125oC (Package F) . . . . . . . . Derate Linearly at
8mW/oC to 300mW
Operating Temperature Range, TA
Package Type F. . . . . . . . . . . . . . . . . . . . . . . . . .-55oC to +125oC
Storage Temperature, TSTG . . . . . . . . . . . . . . . . . .-65oC to +150oC
Lead Temperature (During Soldering)
At Distance 1/16in. ± 1/32in. (1.59mm ± 0.79mm)
From Case For 10s Max . . . . . . . . . . . . . . . . . . . . . . . . . . +265oC
Unit Inserted Into a PC Board (Min Thickness 1/16in., 1.59mm)
With Solder Contacting Lead Tips Only. . . . . . . . . . . . . . . +300oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Recommended Operating Conditions
Supply Voltage Range, VCC
Unless Otherwise Specified, All Voltages Referenced to GND
TA = Full Package Temperature Range
CD54AC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
CD54ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VI, VO. . . . . . . . . . . . . . . . . . 0V to VCC
Operating Temperature, TA . . . . . . . . . . . . . . . . . . .-55oC to +125oC
Input Rise and Fall Slew Rate, dt/dv
at 1.5V to 3V (AC Types). . . . . . . . . . . . . . . . . . . 0ns/V to 50ns/V
at 3.6V to 5.5V (AC Types) . . . . . . . . . . . . . . . . . 0ns/V to 20ns/V
at 4.5V to 5.5V (AC Types) . . . . . . . . . . . . . . . . . 0ns/V to 10ns/V
COMING SOON!
COMPLETE DATA SHEET
