OKI MSC7128-xxGS-BK, MSC7128-xxSS Datasheet
E2C0029-27-Y4
¡ Semiconductor MSC7128-xx
¡ Semiconductor
This version: Nov. 1997
Previous version: Jul. 1996
MSC7128-xx
5 ¥ 7-Dot Character ¥ 16-Digit Display Controller/Driver
GENERAL DESCRIPTION
The MSC7128-xx is a general purpose display controller for vacuum fluorescent display tube.
The MSC7128-xx drives displays with up to 35 anodes (dots) and up to 16 grids (characters) plus
a cursor.
The controller accepts command and display data input words on a clocked serial input line.
Commands control the on/off duty cycle, starting character position, number of characters to
display and display modes (PLA mode and Lamp Test mode). An internal PLA-type character
generator provides character decoding and dot pattern generation for the full 128 characters.
A 35 ¥ 128-bit PLA (ROM) code is programmable.
FEATURES
• Logic supply voltage (VDD) :+5V
• VF driver supply voltage (VEE) :–55V
• Driver output current
– VF grid driver :–30mA
– VF anode driver :–2mA
– VF cursor driver :–10mA
• Direct drive capability for vacuum fluorescent display (no pull-down resistor is required)
• Built-in oscillation circuit
• Built-in power-on-reset circuit with external C
• Serial host interface (data in, clock, chip select)
• Serial data input for 8-bit control and display data words
• Command functions
– On/off duty cycle : 0/16 to 15/16
– Character display position : 0 to 15
– Number of display digits :1 to 16
– Display modes : PLA mode, and Lamp Test mode
• Built-in 35 x 128-bit PLA-type character generator
– Character font :5 ¥ 7
– Number of characters :128
– Programmable PLA code
• Package options:
64-pin plastic SDIP (SDIP64-P-750-1.78) (Product name : MSM7128-xxSS)
64-pin plastic QFP (QFP64-P-1420-1.00-BK) (Product name : MSM7128-xxGS-BK)
xx indicates the code number.
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¡ Semiconductor MSC7128-xx
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BLOCK DIAGRAM
SEG
DRIVER
LATCHPLALATCHRAM
8-BIT
SHIFT REGISTER
V
DD
CS
CP
RESET
TEST
STEP
TEST
COUNT
V
SS
OSCI
OSCO
CS
CP
RESET
OSC
SEG1
SEG2
SEG34
SEG35
SEG36
COM1
COM2
COM14
COM15
COM16
V
EE
8
8
b0-7
3
5
b4-6
COMMAND
DECODER
RL
TIMING
GENERATOR
CONTROL
RESET
RESET
CS
CP
D.G
LOAD
4
b0-3
4
b0-3
RESET
R
DUTYCYCLE REGISTER
DUTYCYCLE
COUNTER
b0-3
4
D.G
LOAD
RESET
RESET
DUTY AND
BLANK
GENERATOR
RESET
4
DIGIT
COUNT
REGISTER
BA
A = B
ADDRESS
COMP
W.A.C. COUNT
W.A.C. COUNT
W.A.C. LOAD
b0-3
4
WRITE
ADDRESS
COUNTER
READ
ADDRESS
COUNTER
44 4416
W/R
ADDRESS
SELECTOR
4
DISPLAY
DATA
BUFFER
8BITS ¥
16 WORDS
8 7 35 36
fW
RAMPC
LR
ROM
PC1
ROM
PC2
fR
RESET
fDIG
RESET
LATCH
BLANK
DUTY AND BLANK
DECODER
fSEG
RESET
LT
LR S
CHARACTER
GENERATOR
35 ¥ 128 BITS
OE
OE
COM
DRIVER
DA
¡ Semiconductor MSC7128-xx
INPUT AND OUTPUT CONFIGURATION
• INPUT PIN
V
DD
DA
CS
CP
OSCI
V
DD
R
V
DD
RESET
• OUTPUT PIN
OSCO
TEST COUNT
TEST STEP
GND
V
DD
V
DD
SEG1 - 35
SEG36
COM1-16
V
V
DD
EE
V
EE
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¡ Semiconductor MSC7128-xx
PIN CONFIGURATION (TOP VIEW)
OSC0
OSCI
TEST COUNT
TEST STEP
V
SS
V
EE
COM 1
COM 2
COM 3
COM 4
COM 5
COM 6
COM 7
COM 8
COM 9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
SEG 36
SEG 35
SEG 34
SEG 33
SEG 32
SEG 31
SEG 30
SEG 29
SEG 28
SEG 27
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
CS
DA
CP
RESET
1
V
DD
V
2
DD
SEG 1
SEG 2
SEG 3
SEG 4
SEG 5
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
SEG 15
SEG 16
SEG 17
SEG 18
SEG 19
SEG 20
SEG 21
SEG 22
SEG 23
SEG 24
SEG 25
SEG 26
64-Pin Plastic Shrink DIP
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¡ Semiconductor MSC7128-xx
,
PIN CONFIGURATION (TOP VIEW)
SS
EE
V
COM 1
64
63
V
TEST STEP
62
61
OSC O
OSC I
TEST COUNT
60
59
58
CS
57
DA
56
CP
55
DD1VDD2
RESET
V
54
53
52
COM 2
COM 3
COM 4
COM 5
COM 6
COM 7
COM 8
COM 9
COM 10
COM 11
COM 12
COM 13
COM 14
COM 15
COM 16
SEG 36
SEG 35
SEG 34
SEG 33
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
2
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
SEG 1
SEG 2
SEG 3
SEG 4
SEG 5
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
SEG 15
SEG 16
SEG 17
SEG 18
SEG 19
20
SEG 3221SEG 3122SEG 3023SEG 2924SEG 2825SEG 27
26
27
SEG 25
SEG 26
28
29
SEG 24
SEG 23
30
31
SEG 22
SEG 21
32
SEG 20
64-Pin Plastic QFP
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¡ Semiconductor MSC7128-xx
PIN DESCRIPTION
Symbol Type Description
V
V
V
V
DD1
DD2
SS
EE
—
—
—
—
Connected to
Power source
– VSS: Internal logic supply voltage
V
DD1
V
– VEE: VF tube driving circuit supply voltage
DD2
DA I Serial data input from LSB (positive logic)Microcomputer
CP I Microcomputer
CS I Microcomputer
OSCI I
—
OSCO O
Shift clock input. Data is shifted at the leading edge of
the CP.
Chip select input. When the PIN is High, the serial data
transfer is inhibited.
RC oscillation, external RC pin. f
C = 100pF and R = 47kW.
Reset input (pull-up resistor built in). When the pin is
RESET I
—
Low, the internal logic is reset, and the outputs of SEG1
to SEG36 and COM1 to COM16 are Low.
COM1
~
COM16
SEG1
~
SEG35
O VF tube grid electrode
O VF tube anode electrode
VF tube grid electrode driving outputs. This pin can be
connected directly to the VF tube. No pull-down resistor
is required. I
> –30mA
OH
VF tube 5 ¥ 7 -dot anode electrode driving outputs.
This pin can be connected directly to the VF tube. No
pull-down resistor is required. I
VF tube cursor anode electrode driving output.
SEG36 O
VF tube anode electrode
This pin can be connected directly to the VF tube. No
pull-down resistor is required. I
TEST STEP I Test mode setting input (normally open)—
= 250kHz at
OSC
> –2mA
OH
> –10mA
OH
TEST COUNT I Test clock input (normally open)—
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¡ Semiconductor MSC7128-xx
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Condition Unit
Power Supply Voltage (1) VDD–V
Power Supply Voltage (2) VDD–V
Power Dissipation P
Storage Temperature T
Output Current
STG
I
O1
I
O2
I
O3
SS
EE
SS
D
Ta £ 25°C
COM1 to COM16
SEG1 to SEG35
SEG36
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol Condition Max. Unit
Power Supply Voltage (1) VDD–V
Power Supply Voltage (2) VDD–V
High Level Input Voltage VIH–V
CP Frequency f
OSC Frequency f
Operating Temperature T
CP
OSC
op
SS
EE
SS
SS
—
—
—
—Low Level Input Voltage VIL–V
—
100pF, 47kW
—
—
—
—Input Voltage VIN–V
—
Min.
4.5
10
DD
Rating
–0.3 to +6.5
0 to 65
–0.3 to V
Up to 1.0
Typ.
—
DD
+ 0.3
5.5 V
60 V—
—V—0.7V
0.3V
DD
500 kHz——
270 kHz220170
+75 °C—–20
V
V
V
W
°C–55 to +150
mA–40
mA–4
mA–15
V——
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¡ Semiconductor MSC7128-xx
ELECTRICAL CHARACTERISTICS
DC Characteristics
(V
= 5V±10%, VDD–VEE = 60V, Ta = –20 to +75°C)
DD–Vss
Parameter Symbol Condition Max. Unit
High Level Input Voltage V
High Level Input Current
Low Level Input Current
V
V
High Level Output Voltage
V
V
V
V
Low Level Output Voltage
V
V
I
I
I
I
I
IH
IL
IH1
IH2
IL1
IL2
OH1
OH2
OH3
OH4
OL1
OL2
OL3
OL4
SS1
—
—Low Level Input Voltage V
DA, CP, CS
RESET
TEST STEP
TEST COUNT
V
V
V
V
= 5.5V
DD
= 5V
IN
= 5.5V
DD
= 5V
IN
DA, CP, CS
TEST STEP
TEST COUNT
RESET V
OSCO I
COM1~16 I
SEG1~35 I
SEG36 I
OSCO I
COM1~16 I
SEG1~35 I
SEG36 I
V
= 5.5V
DD
V
= 0.5V
IH
= 5.5V
DD
V
= 0.5V
IH
= –500mA
OH
= –30mA
OH
= –2mA
OH
= –10mA
OH
= 500mA
OL
= 100mA
OL
= 100mA
OL
= 100mA
OL
All SEGs on, 16-digit display, duty
cycle 15/16, no load
Min.
0.7V
—V
DD
0.3V
5 mA–5
1mA0.25
5 mA–5
–100 mA–25
—VVDD–0.6
—VVDD–4
—VVDD–3
—VVDD–4
VSS+0.6 V—
VEE+3 V—
VEE+3 V—
VEE+3 V—
15 mA—
DD
V—
Current Consumption
I
I
I
SS2
EE1
EE2
All SEGs Low, all COMs High
All SEGs on, 16-digit display, duty
cycle 15/16, no load
All SEGs Low, all COMs High
1.5 mA—
1.0 mA—
15 mA—
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¡ Semiconductor MSC7128-xx
AC Characteristics
Parameter Symbol Condition Max. Unit
CP Cycle Time t
CP Pulse Width t
Data Set-up Time t
Data Hold Time t
CS Set-up Time t
CS Hold Time t
OSC Frequency f
*T = 1/f
OSC
TIMING DIAGRAM
Data Timing
CP
WCP
DS
DH
CSS
CSH
OSC
(V
—
—
—
—
—
—
R = 47kW, C = 100pF
= 5V±10%, Ta = –20 to +75°C)
DD–VSS
Min.
2
— ms
— ms1
— ms0.5
— ms0.5
— ms1
—s32T*
270 kHz170
0.3
t
CSS
t
WCP
t
DS
0.7
0.3
t
CP
0.7
0.3
t
DH
VALID
0.3 0.3
VALID VALID
t
0.3
CSH
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