Datasheet > 逻辑 > 计数器> DM74ALS161BMX_NL

DM74ALS161BMX_NL

更新时间： 2024-09-21 13:07:23

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		计数器
页数	文件大小	规格书
9页	95K
描述
Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, PDSO16, 0.150 INCH, MS-012, SOIC-16

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DM74ALS161BMX_NL 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOP, SOP16,.25
针数：	16	Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01	风险等级：	5.42
其他特性：	TCO OUTPUT	计数方向：	UP
系列：	ALS	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e3	长度：	9.9 mm
负载/预设输入：	YES	逻辑集成电路类型：	BINARY COUNTER
最大频率@ Nom-Sup：	40000000 Hz	工作模式：	SYNCHRONOUS
湿度敏感等级：	1	位数：	4
功能数量：	1	端子数量：	16
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP16,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	包装方法：	TAPE AND REEL
峰值回流温度（摄氏度）：	260	电源：	5 V
最大电源电流（ICC）：	21 mA	传播延迟（tpd）：	20 ns
认证状态：	Not Qualified	座面最大高度：	1.75 mm
子类别：	Counters	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	技术：	TTL
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
触发器类型：	POSITIVE EDGE	宽度：	3.9 mm
最小 fmax：	40 MHz	Base Number Matches：	1

DM74ALS161BMX_NL 数据手册

April 1984

Revised February 2000

DM74ALS161B • DM74ALS162B • DM74ALS163B

Synchronous Four-Bit Counter

The carry look ahead circuitry provides for cascading

General Description

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 output.

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 cas-

caded stages. HIGH-to-LOW level transitions at the enable

These synchronous presettable counters feature an inter-

nal carry look ahead for application in high speed counting

designs. The DM74ALS162B is a four-bit decade counter,

while the DM74ALS161B and DM74ALS163B are four-bit

binary counters. The DM74ALS161B clears asynchro-

nously, while the DM74ALS162B and DM74ALS163B clear

synchronously. The carry output is decoded to prevent

spikes during normal counting mode of operation. Synchro-

nous 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 out-

put counting spikes which are normally associated 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.

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 operating mode

will have no effect until clocking occurs. The function of the

counter (whether enabled, disabled, loading or counting)

will be dictated solely by the conditions meeting the stable

set-up and hold times.

These counters are fully programmable, that is, the outputs

may be preset to either level. As presetting is synchronous,

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.

Features

■ Switching specifications at 50 pF

■ Switching specifications guaranteed over full tempera-

ture and V_CCrange

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 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 maximum count desired can be

accomplished with one external NAND gate. The gate out-

put 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 permissible regardless of the levels of logic on the

clock, enable or load inputs.

■ Advanced oxide-isolated, ion-implanted Schottky TTL

process

■ Functionally and pin-for-pin compatible with Schottky

and low power Schottky TTL counterpart

■ 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

Ordering Code:

Order Number Package Number

Package Description

DM74ALS161BM

DM74ALS161BN

DM74ALS162BM

DM74ALS162BN

DM74ALS163BM

DM74ALS163BN

M16A

N16E

M16A

N16E

M16A

N16E

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

DS006206

www.fairchildsemi.com

12 3 4 5 6 7...9

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与DM74ALS161BMX_NL相关器件

型号	品牌	获取价格	描述	数据表
DM74ALS161BN	FAIRCHILD	获取价格	Synchronous Four-Bit Counter
DM74ALS161BN/A+	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
DM74ALS161BN/B+	ETC	获取价格	Synchronous Up Counter
DM74ALS161J/A+	ETC	获取价格	Synchronous Up Counter
DM74ALS161N/A+	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
DM74ALS161N/B+	ETC	获取价格	Synchronous Up Counter
DM74ALS1620J	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,ALS-TTL,DIP,20PIN,CERAMIC
DM74ALS1620J/A+	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,ALS-TTL,DIP,20PIN,CERAMIC
DM74ALS1620J1	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,ALS-TTL,DIP,20PIN,CERAMIC
DM74ALS1620J-1/A+	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,ALS-TTL,DIP,20PIN,CERAMIC

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