ICM7243 Intersil Corporation, ICM7243 Datasheet - Page 6

• Manufacturer Part Number: ICM7243
• Description: 8-character, Microprocessor-compatible, Led Display Decoder Driver
• Manufacturer: Intersil Corporation

Performance Curves
Pin Descriptions
ICM7243A(B)
A2/DISPlay FULL
SEG a - SEG m,
CHARacter 1 - 8
FIGURE 4. SEGMENT CURRENT vs OUTPUT VOLTAGE
A1/CLeaR
OSC/OFF
SIGNAL
A0/SEN
D0 - D5
CS, CS
MODE
WR
DP
30
20
10
0
0
(2 - 7), (32 - 40)
2 - 9, 32 - 40
(14 - 16)
18 - 21,
SEGMENT VOLTAGE (V)
(8 - 13)
10 - 15
23 - 26
PIN
16
17
31
30
29
28
27
1
V
6
DD
= 5.5V
Six-Bit ASCll Data input pins (active high).
Chip Select from µP address decoder, etc.
WRite pulse input pin (active low). For an active high write pulse, CS can be used, and WR can be used
as CS.
Selects data entry MODE. High selects Sequential Access (SA) mode where first entry is displayed in
“leftmost” character and subsequent entries appear to the “right”. Low selects the Random Access
(RA) mode where data is displayed on the character addressed via A0 - A2 Address pins.
In RA mode it is the LSB of the character Address. In SA mode it is used for cascading devices for
displays of more than 8 characters (active high enables device controller).
In RA mode this is the second bit of the address. In
Counter, the Data Memory and the display.
In
indicating DISPlay FULL.
OSCillator input pin. Adding capacitance to V
oscillator can be applied to this pin. A low at this input sets the device into a (shutdown) mode, shutting
OFF the display and oscillator but retaining data stored in memory.
SEGment driver outputs.
CHARacter driver outputs.
4.5V
2
RA
5.0V
mode this is the MSB of the Address. In
3
ICM7243
ICM7243
FIGURE 5. CHARACTER CURRENT vs OUPUT VOLTAGE
DD
FUNCTION
will lower the internal oscillator frequency. An external
500
400
300
200
100
SA
SA
0
mode, the output goes high after eight entries,
mode, a low input will CLeaR the Serial Address
SEGMENT VOLTAGE (V)
V
DD
1
= 5.5V
2
4.5V
5.0V
October 28, 2005
3
FN3162.3