ICM7224 Intersil Corporation, ICM7224 Datasheet - Page 4

• Manufacturer Part Number: ICM7224
• Description: 41/2 Digit LCD Display Counter
• Manufacturer: Intersil Corporation

Typical Performance Curves
FIGURE 2. OPERATING SUPPLY CURRENT AS A FUNCTION
FIGURE 4. MAXIMUM COUNT FREQUENCY (TYPICAL) AS A
TERMINAL
45
40
35
30
25
20
15
30
25
20
15
10
5
0
29
31
33
34
1
SINE WAVE INPUT
SWINGING FULL SUPPLY
LCD DEVICES, TEST CIRCUIT
DISPLAY BLANK
PIN 36 OPEN
OF SUPPLY VOLTAGE
FUNCTION OF SUPPLY VOLTAGE
4
2
Leading Zero Blanking
INput
COUNT INHIBIT
RESET
STORE
T
A
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
= 25
3
o
C
4
5
INPUT
T
T
A
A
= 70
= -20
o
5
C
TABLE 1. CONTROL INPUT DEFINITIONS
o
C
T
T
T
A
A
A
6
6
= 25
= 70
= -20
o
o
C
C
o
ICM7224
V
V
V
V
V
V
V
V
C
DD
SS
DD
SS
DD
SS
DD
SS
7
or Floating
or Floating
or Floating
or Floating
4
VOLTAGE
FIGURE 3. BACKPLANE FREQUENCY AS A FUNCTION OF
FIGURE 5. SUPPLY CURRENT AS A FUNCTION OF COUNT
0.01
0.1
1000
10
1kHz
100
1
10
1
1
V+ = 5V
T
A
LCD DEVICES
T
OSCILLATOR CAPACITOR C
FREQUENCY
= 25
A
10kHz
V
= 25
SUPPLY
o
C
o
C
V
SUPPLY
Leading Zero Blanking Enabled
Leading Zeroes Displayed
Counter Enabled
Counter Disabled
Inactive
Counter Reset to 0000
Output Latches not Updated
Output Latches Updated
= 4V
100kHz
10
V
SUPPLY
= 3V
ƒ
C
COUNT
OSC
= 5V
V
1MHz
(pF)
SUPPLY
FUNCTION
100
OSC
= 6V
10MHz
100MHz
1000