Datasheet > MM74C925

MM74C925

更新时间： 2024-11-04 22:46:07

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	100K
描述
4-Digit Counters with Multiplexed

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中文翻译

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数据手册

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MM74C925 数据手册

October 1987

Revised January 1999

MM74C925 • MM74C926 • MM74C927 • MM74C928

4-Digit Counters with Multiplexed

7-Segment Output Drivers

back LOW only when the counter is reset. Thus, this is a

3½-digit counter.

General Description

The MM74C925, MM74C926, MM74C927 and MM74C928

CMOS counters consist of a 4-digit counter, an internal out-

put latch, NPN output sourcing drivers for a 7-segment dis-

play, and an internal multiplexing circuitry with four

multiplexing outputs. The multiplexing circuit has its own

free-running oscillator, and requires no external clock. The

counters advance on negative edge of clock. A HIGH sig-

nal on the Reset input will reset the counter to zero, and

reset the carry-out LOW. A LOW signal on the Latch

Enable input will latch the number in the counters into the

internal output latches. A HIGH signal on Display Select

input will select the number in the counter to be displayed;

a LOW level signal on the Display Select will select the

number in the output latch to be displayed.

Features

■ Wide supply voltage range: 3V to 6V

■ Guaranteed noise margin: 1V

■ High noise immunity: 0.45 V_CC(typ.)

■ High segment sourcing current: 40 mA

@ V_CC− 1.6V, V_CC= 5V

■ Internal multiplexing circuitry

Design Considerations

Segment resistors are desirable to minimize power dissipa-

tion and chip heating. The DS75492 serves as a good digit

driver when it is desired to drive bright displays. When

using this driver with a 5V supply at room temperature, the

display can be driven without segment resistors to full illu-

mination. The user must use caution in this mode however,

to prevent overheating of the device by using too high a

supply voltage or by operating at high ambient tempera-

tures.

The MM74C925 is a 4-decade counter and has Latch

Enable, Clock and Reset inputs.

The MM74C926 is like the MM74C925 except that it has a

display select and a carry-out used for cascading counters.

The carry-out signal goes HIGH at 6000, goes back LOW

at 0000.

The MM74C927 is like the MM74C926 except the second

most significant digit divides by 6 rather than 10. Thus, if

the clock input frequency is 10 Hz, the display would read

tenths of seconds and minutes (i.e., 9:59.9).

The input protection circuitry consists of a series resistor,

and a diode to ground. Thus input signals exceeding V_CC

will not be clamped. This input signal should not be allowed

to exceed 15V.

The MM74C928 is like the MM74C926 except the most sig-

nificant digit divides by 2 rather than 10 and the carry-out is

an overflow indicator which is HIGH at 2000, and it goes

Ordering Code:

Order Number Package Number

Package Description

MM74C925N

MM74C926N

MM74C927N

MM74C928N

N16E

N18A

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

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

DS005919.prf

www.fairchildsemi.com

12 3 4 5 6 7...9

中文翻译

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与MM74C925相关器件

型号	品牌	获取价格	描述	数据表
MM74C925_04	FAIRCHILD	获取价格	4-Digit Counters with Multiplexed
MM74C925J	TI	获取价格	CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, CDIP16, CERAMI
MM74C925J	NSC	获取价格	IC CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, CDIP16, CER
MM74C925N	FAIRCHILD	获取价格	4-Digit Counters with Multiplexed
MM74C926	NSC	获取价格	4-Digit Counters with Multiplexed 7-Segment Output Drivers
MM74C926	FAIRCHILD	获取价格	4-Digit Counters with Multiplexed
MM74C926J	TI	获取价格	CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, CDIP18, CERAMI
MM74C926J	NSC	获取价格	IC CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, CDIP18, CER
MM74C926N	FAIRCHILD	获取价格	4-Digit Counters with Multiplexed
MM74C926N	TI	获取价格	CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, PDIP18, PLASTI

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