74C911 datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > 74C911

Preview

74C911: Description4-Digit Expandable Segment Display Controller; File Size91KB，8 Pages; ManufacturerFairchild; Websitehttp://www.fairchildsemi.com/

Download Datasheet Compare View All

74C911 Overview

4-Digit Expandable Segment Display Controller

Preview

Download Datasheet

View All

MM74C911 4-Digit Expandable Segment Display Controller

October 1987

Revised January 1999

MM74C911

4-Digit Expandable Segment Display Controller

General Description

The MM74C911 display controller is an interface element

with memory that drives a 4-digit, 8-segment LED display.

The MM74C911 allows individual control of any segment in

the 4-digit display. The number of segments per digit can

be expanded without any external components. For exam-

ple, two MM74C911’s can be cascaded to drive a 16-seg-

ment alpha-numeric display.

The display controllers receive data information through 8

data lines a, b…DP, and digit information through 2

address inputs K1 and K2. The input data is written into the

ENABLE, CE, and WRITE ENABLE, WE, are LOW and is

latched when either CE or WE return HIGH. Data hold time

is not required.

A self-contained internal oscillator sequentially presents

the stored data to high drive (100 mA typ.) 3-STATE output

drivers which directly drive the LED display. The drivers are

active when the control pin labeled SEGMENT OUTPUT

ENABLE, SOE, is LOW and go into 3-STATE when SOE is

HIGH. This feature allows for duty cycle brightness control,

or for disabling the output drive for power conservation.

The digit outputs directly drive the base of the digit transis-

tor when the control pin labeled DIGIT INPUT OUTPUT,

DIO, is LOW. When DIO is HIGH, the digit lines turn into

inputs and the internal scanning multiplexer is disabled.

When any digit line is forced HIGH by an external device,

usually another MM74C911, the data information for that

digit is presented to the output. In this manner, 16-segment

alpha-numeric displays, 24- or 32-segment displays, or an

array of discrete LED's can be controlled by the simple cas-

cading of expandable segment display controllers. All

inputs except digit inputs are TTL compatible and do not

clamp input voltages above V

Features

Direct segment drive (100 mA typ.) 3-STATE

4 registers addressed like RAM

Internal oscillator and scanning circuit

Direct base drive to digit transistor

Segment expandability without external components

TTL compatible inputs

Power saver mode—5

µW

(typ.)

Ordering Code:

Order Number

MM74C991N

Package Number

N28B

Package Description

28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS−010, 0.600” Wide

Connection Diagram

Pin Assignments for DIP

Top View

DS005915.prf

www.fairchildsemi.com

74C911 Related Products

	74C911	MM74C991N	MM74C911
Description	4-Digit Expandable Segment Display Controller	4-Digit Expandable Segment Display Controller	4-Digit Expandable Segment Display Controller

Recommended Resources

Stabilized dual power supply circuit

High supply voltage flasher

MOSFET resonant DC-DC converter circuit

Pulse oscillator circuit with preset pulse number

Basic radio transceiver circuit composed of F36-F/J

555 car wiper automatic controller circuit

You don't take work home.: Balancing work and life is a commonplace, but few people can do it. However, if you don't value your personal time, how can you expect others to care? There are so many things to do, and there is neve...; yimeng1988 Talking about work

Today is such a tragic day.: Today is such a miserable day. I've been wanting an A8 development board so much lately. My company can't get online, so I asked a friend to help me buy one, but she didn't get it. She doesn't know ho...; hg0136 DSP and ARM Processors

Timer capture and match conflict: I use the CORTEX-M3 core, use TIM1 as the capture interrupt, and TIM3 as the match update interrupt, but I found that the capture of TIM1 is only useful after the TIM3 match interrupt is disabled. Doe...; gary_81 Embedded System

Ask for microcontroller eeprom memory expansion: Dear experts, I want to use e2prom to expand the memory of 8051 microcontroller, but I use at24c64 chip. I checked the data and found that there is a self-reading cycle of 5ms, but I don’t know what t...; 宋子彬33 51mcu

Problems between Windows CE 5.0 and MBCS: When compiling a program for Windows CE 5.0, the character set used is MBCS, but an error occurred during compilation: 1>D:\Program Files\Microsoft Visual Studio 8\VC\ce\atlmfc\include\afxv_w32.h(227)...; jiessiesun Embedded System

stm32f769 register configuration SD card --SD card write and read: u8 SD_WriteDisk(u8*buf,u32 sector,u32 cnt) { u8 sta=SD_OK; u32 n; u8 sta=SD_OK; u32 n; u8 sta=SD_OK; u32 n; u8 sta=SD_OK; u32 n; u8 sta=SD_OK; u32 n; u8 sta=SD_OK; u32 n; u8 sta=SD_OK; u32 n; u8 sta=S...; star_66666 stm32/stm8

Shortcut: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ

Popular Components