MM74C905 Approximation Register Datasheet

MM74C905 Datasheet, PDF, Equivalent


Part Number

MM74C905

Description

12-Bit Successive Approximation Register

Manufacture

Fairchild

Total Page 8 Pages
Datasheet
Download MM74C905 Datasheet


MM74C905
October 1987
Revised January 1999
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-010, 0.600” Wide
Connection Diagram
Pin Assignments for DIP
© 1999 Fairchild Semiconductor Corporation DS005910.prf
www.fairchildsemi.com

MM74C905
Truth Table
Time
Inputs
Outputs
tn D S E D0 Q11 Q10 Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 CC
0 X LL X X X X X X X X X X X X X X
1 D11 H L X L H H H H H H H H H H H H
2 D10 H L D11 D11 L
HHHHHHHHHHH
3 D9 H L D10 D11 D10 L H H H H H H H H H H
4 D8 H L D9 D11 D10 D9 L H H H H H H H H H
5 D7 H L D8 D11 D10 D9 D8 L H H H H H H H H
6 D6 H L D7 D11 D10 D9 D8 D7 L H H H H H H H
7 D5 H L D6 D11 D10 D9 D8 D7 D6 L H H H H H H
8 D4 H L D5 D11 D10 D9 D8 D7 D6 D5 L H H H H H
9 D3 H L D4 D11 D10 D9 D8 D7 D6 D5 D4 L H H H H
10 D2 H L D3 D11 D10 D9 D8 D7 D6 D5 D4 D3 L H H H
11 D1 H L D2 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 L H H
12 D0 H L D1 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 L H
13 X H L D0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 L
14 X X L X D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 L
X XH X
H NC NC NC NC NC NC NC NC NC NC NC NC
H = HIGH Level
L = LOW Level
X = Don’t Care
NC = No Change
www.fairchildsemi.com
2


Features MM74C905 12-Bit Successive Approximation Register October 1987 Revised January 1999 MM74C905 12-Bit Successive Appro ximation Register General Description T he MM74C905 CMOS 12-bit successive appr oximation register contains all the dig it control and storage necessary for su ccessive approximation analog-to-digita l conversion. Because of the unique cap ability of CMOS to switch to each suppl y rail without any offset voltage, it c an also be used in digital systems as t he control and storage element in repet itive routines. Features s Wide supply voltage range: s Guaranteed noise marg in: s High noise immunity: 3.0V to 15V 1.0V 0.45 VCC (typ) Fan out of 2 drivin g 74L s Low power TTL compatibility: s Provision for register extension or t runcation s Operates in START/STOP or c ontinuous conversion mode s Drive ladde r switches directly. For 10 bits or les s with 50k/100k R/2R ladder network Or dering Code: Order Number MM74C905N Pac kage Number N24A Package Description 24-Lead Plastic Dual-In-Li.
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