9-15
Switching Specifications V
DD
= 5V, V
SS
= 0V, T
A
= 25
o
C
PARAMETER MIN TYP MAX UNIT
UP/DOWN Setup Time, t
UCS
300 - - ns
UP/DOWN Hold Time, t
UCH
1500 750 - ns
COUNT Pulse Width High, t
CWH
250 100 - ns
COUNT Pulse Width Low, t
CWI
250 100 - ns
COUNT to CARRY/BORROW Delay, t
CB
- 750 - ns
CARRY/BORROW Pulse Width t
BW
- 100 - ns
COUNT to EQUAL Delay, t
CE
- 500 - ns
COUNT to ZERO Delay, t
CZ
- 300 - ns
RESET Pulse Width, t
RST
1000 500 - ns
NOTES:
1. In the ICM7217 the UP/DOWN, STORE, RESET and the BCD I/O as inputs have pullup or pulldown devices which consume power when
connected to the opposite supply. Under these conditions, with the display off, the device will consume typically 750µA.
2. These voltages are adjusted to allow the use of thumbwheel switches for the ICM7217. Note that a high level is taken as an input logic
zero for ICM7217 common-cathode versions.
3. Parameters not tested (Guaranteed by Design).
Timing Waveforms
FIGURE 1. MULTIPLEX TIMING
10µs TYP 400µs TYP
FREE-RUNNING
FREE-RUNNING
INTERDIGIT BLANK
D4
D3
D2
D1
SCAN
INTERNAL OSC
OUTPUT
INTERNAL
(BCD AND
SEGMENT
ENABLE)
INTERNAL
(COMMON
ANODE
DIGIT
STROBES)
D4
D3
D2
D1
ICM7217
