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MM74C905

12-Bit Successive Approximation Register

Fairchild Semiconductor 

October 1987

Revised July 2003

MM74C905

12-Bit Successive Approximation Register

General Description

The MM74C905 CMOS 12-bit successive approximation

register contains all the digit control and storage necessary

for successive approximation analog-to-digital conversion.

Because of the unique capability of CMOS to switch to

each supply rail without any offset voltage, it can also be

used in digital systems as the control and storage element

in repetitive routines.

Features

s Wide supply voltage range: 3.0V to 15V

s Guaranteed noise margin: 1.0V

s High noise immunity: 0.45 VCC (typ)

s Low power TTL compatibility: Fan out of 2 driving 74L

s Provision for register extension or truncation

s Operates in START/STOP or continuous conversion

mode

s Drive ladder switches directly. For 10 bits or less with

50k/100k R/2R ladder network

Ordering Code:

Order Number Package Number

Package Description

MM74C905N

N24A

24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-011, 0.600" Wide

Connection Diagram

Pin Assignments for DIP

© 2003 Fairchild Semiconductor Corporation DS005910

www.fairchildsemi.com

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