dm74als163b Fairchild Semiconductor, dm74als163b Datasheet

dm74als163b

Manufacturer Part Number

dm74als163b

Description

Dm74als161b, Dm74als162b, Dm74als163b Synchronous Four-bit Counter

Manufacturer

Fairchild Semiconductor

Datasheet

1.DM74ALS163B.pdf (12 pages)

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DM74ALS16XB Rev. 1.2

DM74ALS161B, DM74ALS162B, DM74ALS163B

Synchronous Four-Bit Counter

Features

General Description

These synchronous presettable counters feature an

internal carry look ahead for application in high speed

counting designs. The DM74ALS162B is a four-bit

decade

DM74ALS163B are four-bit binary counters. The

DM74ALS161B

DM74ALS162B and DM74ALS163B clear synchro-

nously. The carry output is decoded to prevent spikes

during normal counting mode of operation. Synchronous

operation is provided by having all flip-flops clocked

simultaneously so that outputs change coincident with

each other when so instructed by count enable inputs

and internal gating. This mode of operation eliminates

the output counting spikes which are normally associ-

ated with asynchronous (ripple clock) counters. A

buffered clock input triggers the four flip-flops on the

rising (positive-going) edge of the clock input waveform.

These counters are fully programmable, that is, the out-

puts may be preset to either level. As presetting is syn-

chronous, setting up a low level at the load input

disables the counter and causes the outputs to agree

with set up data after the next clock pulse regardless of

the levels of enable input. LOW-to-HIGH transitions at

the load input are perfectly acceptable regardless of the

logic levels on the clock or enable inputs.

The DM74ALS161B clear function is asynchronous. A

low level at the clear input sets all four of the flip-flop

outputs LOW regardless of the levels of clock, load or

enable inputs. These two counters are provided with a

clear on power-up feature. The DM74ALS162B and

DM74ALS163B clear function is synchronous; and a low

level at the clear input sets all four of the flip-flop outputs

Switching specifications at 50pF

Switching specifications guaranteed over full

temperature and V

Advanced oxide-isolated, ion-implanted Schottky

TTL process

Functionally and pin-for-pin compatible with

Schottky and low power Schottky TTL counterpart

counter,

clears

while

range

asynchronously,

the

DM74ALS161B

while

and

the

LOW after the next clock pulse, regardless of the levels

of enable inputs. This synchronous clear allows the

count length to be modified easily, as decoding the max-

imum count desired can be accomplished with one

external NAND gate. The gate output is connected to the

clear input to synchronously clear the counter to all low

outputs. LOW-to-HIGH transitions at the clear input of

the DM74ALS162B and DM74ALS163B are also permis-

sible regardless of the levels of logic on the clock, enable

or load inputs.

The carry look ahead circuitry provides for cascading

counters for n bit synchronous application without addi-

tional gating. Instrumental in accomplishing this function

are two count enable inputs (P and T) and a ripple carry

output. Both count enable inputs must be HIGH to count.

The T input is fed forward to enable the ripple carry out-

put. The ripple carry output thus enabled will produce a

high level output pulse with a duration approximately

equal to the high level portion of QA output. This high

level overflow ripple carry pulse can be used to enable

successive cascaded stages. HIGH-to-LOW level transi-

tions at the enable P or T inputs of the DM74ALS161B

through DM74ALS163B may occur regardless of the

logic level on the clock.

The DM74ALS161B through DM74ALS163B feature a

fully independent clock circuit. changes made to control

inputs (enable P or T, or load) that will modify the operat-

ing mode will have no effect until clocking occurs. The

function of the counter (whether enabled, disabled, load-

ing or counting) will be dictated solely by the conditions

meeting the stable set-up and hold times.

Improved AC performance over Schottky and low

power Schottky counterparts

Synchronously programmable

Internal look ahead for fast counting

Carry output for n-bit cascading

Synchronous counting

Load control line

ESD inputs

www.fairchildsemi.com

May 2007

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dm74als163b Summary of contents

Page 1

... LOW regardless of the levels of clock, load or enable inputs. These two counters are provided with a clear on power-up feature. The DM74ALS162B and DM74ALS163B clear function is synchronous; and a low level at the clear input sets all four of the flip-flop outputs ©1984 Fairchild Semiconductor Corporation DM74ALS16XB Rev ...

Page 2

... Ordering Information Order Package Number Number DM74ALS161BM M16A DM74ALS162BM M16A DM74ALS162BN N16E DM74ALS163BM M16A DM74ALS163BN N16E Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. Connection Diagram Mode Select Table Clear Load ...

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... The symbol ( ) indicates that the rising edge of the clock is used as a reference. ©1984 Fairchild Semiconductor Corporation DM74ALS16XB Rev. 1.2 Parameter Parameter Data Load Clear (Only for DM74ALS162B LOW and DM74ALS163B) HIGH Clear Inactive Data Load Clear (Only for DM74ALS162B and DM74ALS163B Clear CLK HIGH or LOW ...

Page 9

... LOW-to-HIGH Level Output t Propagation Delay Time, PHL HIGH-to-LOW Level Output t Propagation Delay Time, PHL HIGH-to-LOW Level Output Switching Characteristics DM74ALS162B, DM74ALS163B Over recommended operating free air temperature range. Symbol Parameter f Maximum Clock Frequency MAX t Propagation Delay Time, PLH ...

Page 10

... Physical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow ©1984 Fairchild Semiconductor Corporation DM74ALS16XB Rev. 1.2 Package Number M16A 10 www.fairchildsemi.com ...

Page 11

... Physical Dimensions (Continued) Dimensions are in inches (millimeters) unless otherwise noted. Figure 2. 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide ©1984 Fairchild Semiconductor Corporation DM74ALS16XB Rev. 1.2 Package Number N16E 11 www.fairchildsemi.com ...

Page 12

... TRADEMARKS The following are registered and unregistered trademarks and service marks Fairchild Semiconductor owns or is authorized to use and is not intended exhaustive list of all such trademarks ® ACEx Build it Now™ CorePLUS™ CROSSVOLT™ CTL™ Current Transfer Logic™ ...

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