SLDS031A – APRIL 1985 – REVISED APRIL 1993
SN75555 . . . N PACKAGE
(TOP VIEW)
Each Device Drives 32 Electrodes
90-V Output Voltage Swing Capability
Using Ramped Supply
Q17
Q16
Q18
Q19
Q20
Q21
Q22
1
40
39
38
37
36
15-mA Output Source and Sink Current
Capability
2
Q15
3
High-Speed Serially-Shifted Data Input
Totem-Pole Outputs
Q14
4
Q13
5
Q12
6
35 Q23
Latches on All Driver Outputs
7
34
33
32
31
30
29
28
27
26
25
24
23
22
21
Q11
Q24
8
Q10
Q25
description
9
Q9
Q26
The SN65555, SN75555, SN65556, and
SN75556 are monolithic BIDFET† integrated
circuits designed to drive the column electrodes of
an electroluminescent display. The SN65556 and
SN75556 output sequence is reversed from the
SN65555 and SN75555 for ease in printed-circuit-
board layout.
10
11
12
13
14
15
16
17
18
19
20
Q8
Q27
Q7
Q28
Q6
Q29
Q5
Q30
Q4
Q31
Q3
Q32
Q2
OUTPUT ENABLE
DATA IN
Q1
The devices consist of a 32-bit shift register, 32
latches, and 32 output AND gates. Serial data is
entered into the shift register on the low-to-high
transition of CLOCK. When high, LATCHENABLE
transfers the shift register contents to the outputs
of the 32 latches. When OUTPUT ENABLE is
high, all Q outputs are enabled. Data must be
loaded into the latches and OUTPUT ENABLE
SERIAL OUT
CLOCK
GND
LATCH ENABLE
V
V
CC1
CC2
SN65555, SN75555 . . . FN PACKAGE
(TOP VIEW)
must be high before supply voltage V
ramped up.
is
CC2
6
5
4
3
2
1 44 43 42 41 40
39
Q23
Q24
Q25
Q26
Q27
Q28
Q29
Q11
Q10
Q9
Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
7
Serial data output from the shift register can be
used to cascade shift registers. This output is not
affected by LATCH ENABLE or OUTPUT
ENABLE.
8
38
37
36
35
34
33
9
10
11
12
13
14
15
16
17
The SN65555 and SN65556 are characterized for
operation from –40 C to 85 C. The SN75555 and
SN75556 are characterized for operation from
0 C to 70 C.
32 Q30
31 Q31
30
Q32
NC
29
18 19 20 21 22 23 24 25 26 27 28
NC – No internal connection
† BIDFET – Bipolar, double-diffused, N-channel and P-channel MOS transistors on same chip. This is a patented process.
Copyright 1993, Texas Instruments Incorporated
4–1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265