CD54ACT163F3A

Manufacturer Part NumberCD54ACT163F3A
DescriptionSynchronous Presettable Binary Counters with Synchronous Reset
ManufacturerTexas Instruments
CD54ACT163F3A datasheet
 


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Inputs Are TTL-Voltage Compatible
Internal Look-Ahead for Fast Counting
Carry Output for n-Bit Cascading
Synchronous Counting
Synchronously Programmable
description/ordering information
The ’ACT163 devices are 4-bit binary counters.
These synchronous, presettable counters feature
an internal carry look-ahead for application in
high-speed
counting
designs. Synchronous
operation is provided by having all flip-flops
clocked simultaneously so that the outputs change, coincident with each other, when instructed by the
count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting
spikes normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the
four flip-flops on the rising (positive-going) edge of the clock waveform.
The counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15.
Presetting is synchronous; therefore, setting up a low level at the load input disables the counter and causes
the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.
The clear function is synchronous. A low level at the clear (CLR) input sets all four of the flip-flop outputs low
after the next low-to-high transition of CLK, regardless of the levels of the enable inputs. This synchronous clear
allows the count length to be modified easily by decoding the Q outputs for the maximum count desired. The
active-low output of the gate used for decoding is connected to CLR to synchronously clear the counter to 0000
(LLLL).
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without
additional gating. ENP, ENT, and a ripple-carry output (RCO) are instrumental in accomplishing this function.
Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a
high-level pulse while the count is maximum (9 or 15, with Q
can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the
level of CLK.
These devices feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD) that
modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of
the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the
stable setup and hold times.
T A
PDIP – E
–55 C to 125 C
55 C to 125 C
SOIC – M
SOIC
CDIP – F
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
4-BIT SYNCHRONOUS BINARY COUNTERS
CD54ACT163 . . . F PACKAGE
CD74ACT163 . . . E OR M PACKAGE
CLR
CLK
ENP
GND
high). This high-level overflow ripple-carry pulse
A
ORDERING INFORMATION
ORDERABLE
PACKAGE †
PART NUMBER
Tube
CD74ACT163E
Tube
CD74ACT163M
M
Tape and reel
CD74ACT163M96
Tube
CD54ACT163F3A
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
CD54ACT163, CD74ACT163
SCHS300B – APRIL 2000 – REVISED MARCH 2003
(TOP VIEW)
V
1
16
CC
RCO
2
15
A
Q
3
14
A
B
Q
4
13
B
C
Q
5
12
C
D
Q
6
11
D
ENT
7
10
LOAD
8
9
TOP-SIDE
MARKING
CD74ACT163E
ACT163M
ACT163M
CD54ACT163F3A
Copyright
2003, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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CD54ACT163F3A Summary of contents

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    ... ENT 7 10 LOAD 8 9 TOP-SIDE MARKING CD74ACT163E ACT163M ACT163M CD54ACT163F3A Copyright 2003, Texas Instruments Incorporated On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters. 1 ...

  • Page 2

    CD54ACT163, CD74ACT163 4-BIT SYNCHRONOUS BINARY COUNTERS SCHS300B – APRIL 2000 – REVISED MARCH 2003 CLR CLK ENP high level low level ...

  • Page 3

    LOAD 10 ENT 7 ENP 2 CLK 1 CLR † For simplicity, routing of complementary signals LD and CK is not shown on this overall logic diagram. ...

  • Page 4

    CD54ACT163, CD74ACT163 4-BIT SYNCHRONOUS BINARY COUNTERS SCHS300B – APRIL 2000 – REVISED MARCH 2003 logic symbol, each D/T flip-flop LD (Load) TE (Toggle Enable) CK (Clock) D (Inverted Data) R (Inverted Reset) logic diagram, each D/T flip-flop (positive logic) CK ...

  • Page 5

    The following sequence is illustrated below: 1. Clear outputs to zero (synchronous) 2. Preset to binary 12 3. Count to 13, 14, 15 and 2 4. Inhibit CLR LOAD A B ...

  • Page 6

    CD54ACT163, CD74ACT163 4-BIT SYNCHRONOUS BINARY COUNTERS SCHS300B – APRIL 2000 – REVISED MARCH 2003 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage range ...

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    PARAMETER TEST CONDITIONS ...

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    CD54ACT163, CD74ACT163 4-BIT SYNCHRONOUS BINARY COUNTERS SCHS300B – APRIL 2000 – REVISED MARCH 2003 switching characteristics over recommended operating conditions, C noted) (see Figure 1) FROM PARAMETER (INPUT) (INPUT) f max CLK CLK t pd ENT operating characteristics ...

  • Page 9

    PARAMETER MEASUREMENT INFORMATION R1 = 500 From Output Under Test 500 (see Note A) NOTE: When 1 and LOAD CIRCUIT CLR 1.5 V ...

  • Page 10

    ... PACKAGING INFORMATION (1) Orderable Device Status CD54ACT163F3A ACTIVE CD74ACT163E ACTIVE CD74ACT163M ACTIVE CD74ACT163M96 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. ...

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    ... TI product or service and is an unfair and deceptive business practice not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: ...