4-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTER WITH ON-CHIP LCD DRIVERS
1
2
3
4
5
6
7
8
TC7129
ELECTRICAL CHARACTERISTICS: V+ to V– = 9V, VREF = 1V, TA = +25°C, fCLK = 120 kHz, unless otherwise
indicated. Pin numbers refer to 40-pin DIP.
Symbol
Parameter
Test Conditions
Min
Typ
Max Unit
"Weak Output" Current
Sink/Source
Pins 20, 21 Sink/Source
Pin 27 Sink/Source
—
—
3/3
3/9
—
—
µA
µA
Pin 22 Source Current
Pin 22 Sink Current
—
—
40
3
—
—
µA
µA
PIN CONFIGURATIONS
40-Pin PDIP
OSC
OSC
40 OSC
2
1
2
1
39 DP
1
3
ANNUNICATOR DRIVE
B , C , CONT
38 DP
2
3
37
4
RANGE
1
1
A , G , D
5
36 DGND
1
1
1
1
F , E , DP
6
REF LO
REF HI
IN HI
35
34
33
32
1
1
B , C , LO BATT
7
2
2
A , G , D
8
2
2
2
F , E , DP
9
IN LO
2
2
2
31 BUFF
–
10
11
12
13
14
15
16
17
18
19
20
B , C MINUS
3
3,
TC7129CPL
DISPLAY
OUTPUT
LINES
A , G , D
C
C
30
29
28
3
3
3
3
5
4
4
REF
+
REF
F , E , DP
3
3
B , C BC
4,
COM
4
A , G , D
27 CONT
4
4
F , E , DP
26 INT OUT
4
4
25 INT IN
+
BP
BP
BP
3
2
1
24
23
22
V
V
–
V
LATCH/HOLD
DISP
DP /OR
21 DP /UR
3
4
44-Pin QFP
44-Pin PLCC
6
5
4
3
2
1
44 43 42 41 40
44 43 42 41 40 39 38 37 36 35 34
F , E , DP
F , E , DP
1
REF LO
39
33
32
31
30
29
28
27
26
25
24
23
7
1
2
3
4
REF LO
REF HI
1
1
1
1
1
8
38 REF HI
IN HI
B , C , BATT
B , C , BATT
2 2
A , G , D
2 2 2
2
2
A , G , D
9
37
36 IN LO
IN HI
IN LO
BUFF
NC
2
2
2
F , E , DP
F , E , DP
2 2 2
10
11
12
13
14
15
16
17
2
2
2
B , C MINUS
B , C MINUS
3,
35
34
33
32
31
30
29
BUFF
NC
–
REF
5
6
3
3,
3
NC
NC
TC7129CKW
TC7129CLW
–
REF
A , G , D
A , G , D
3 3
C
C
7
3
3
3
3
+
REF
+
REF
F , E , DP
F , E , DP
3 3
C
8
C
3
3
3
3
B , C BC
B , C BC
9
COM
COM
4
4,
5
4
4,
5
A , G , D
A , G , D
CONT
INT OUT
10
11
CONT
INT OUT
4
4
4
4
4
4
F , E , DP
F , E , DP
4 4
4
4
4
4
18 19 20 21 22 23 24 25 26 27 28
12 13 14 15 16 17 18 19 20 21 22
TELCOM SEMICONDUCTOR, INC.
3-233
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
