CD54AC161/3A
CD54ACT161/3A
S E M I C O N D U C T O R
COMPLETE DATA SHEET
COMING SOON!
Synchronous Presettable Binary Counters
June 1997
Description
Functional Diagram
P0 P1 P2 P3
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.
3
4
5
6
9
2
14
13
12
11
15
SPE
CP
MR
PE
Q0
Q1
Q2
Q3
TC
A LOW level on the Synchronous Parallel Enable 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).
1
7
10
The counters are reset with a LOW level on the Master
Reset input, MR.
TE
GND = 8
VCC = 16
Two count enables, PE and TE, in each counter are provided
for n-bit cascading. Reset action occurs regardless of the
level of the SPE, PE, TE and CP inputs.
ACT INPUT LOAD TABLE
UNIT LOAD (NOTE 1)
INPUT
Pn
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.
0.13
1
CP
MR, TE
SPE
PE
0.83
0.67
0.5
The CD54AC161/3A and CD54ACT161/3A are supplied in
16 lead dual-in-line ceramic packages (F suffix).
NOTE:
1. Unit load is ∆I limit specified in DC Electrical Specifications
CC
o
Table, e.g., 2.4mA Max at +25 C.
Absolute Maximum Ratings
DC Supply Voltage, V . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6V
Power Dissipation Per Package, P
D
CC
o
o
DC Input Diode Current, I
T = -55 C to +100 C (Package F) . . . . . . . . . . . . . . . . . . 500mW
IK
A
o
o
For V < -0.5V or V > V + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA
T = +100 C to +125 C (Package F) . . . . . . . . Derate Linearly at
I
I
CC
A
o
DC Output Diode Current, I
8mW/ C to 300mW
OK
For V < -0.5V or V > V + 0.5V. . . . . . . . . . . . . . . . . . . . .±50mA Operating Temperature Range, T
O
O
CC
A
o
o
DC Output Source or Sink Current, Per Output Pin, I
Package Type F. . . . . . . . . . . . . . . . . . . . . . . . . .-55 C to +125 C
O
o
o
For V > -0.5V or V < V + 0.5V. . . . . . . . . . . . . . . . . . . . .±50mA
Storage Temperature, T
. . . . . . . . . . . . . . . . . .-65 C to +150 C
O
O
CC
STG
DC V or GND Current, I or I
Lead Temperature (During Soldering)
CC
CC
GND
For Up to 4 Outputs Per Device, Add ±25mA For Each
Additional Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±100mA
At Distance 1/16in. ± 1/32in. (1.59mm ± 0.79mm)
From Case For 10s Max . . . . . . . . . . . . . . . . . . . . . . . . . . +265 C
Unit Inserted Into a PC Board (Min Thickness 1/16in., 1.59mm)
o
o
With Solder Contacting Lead Tips Only. . . . . . . . . . . . . . . +300 C
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
o
o
Supply Voltage Range, V
Operating Temperature, T . . . . . . . . . . . . . . . . . . .-55 C to +125 C
CC
A
Unless Otherwise Specified, All Voltages Referenced to GND
Input Rise and Fall Slew Rate, dt/dv
T = Full Package Temperature Range
CD54AC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
CD54ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
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
A
DC Input or Output Voltage, V , V . . . . . . . . . . . . . . . . . . 0V to V
CC
I
O
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
File Number 3892
Copyright © Harris Corporation 1994
1
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