7217(1997) データシートの表示（PDF） - Intersil

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7217
(Rev.:1997)

4-Digit LED Display, Programmable Up/Down Counter

Intersil 

ICM7217

Switching Specifications VDD = 5V, VSS = 0V, TA = 25oC

PARAMETER

MIN

TYP

MAX

UNIT

UP/DOWN Setup Time, tUCS

300

-

-

ns

UP/DOWN Hold Time, tUCH

1500

750

-

ns

COUNT Pulse Width High, tCWH

250

100

-

ns

COUNT Pulse Width Low, tCWI

250

100

-

ns

COUNT to CARRY/BORROW Delay, tCB

-

750

-

ns

CARRY/BORROW Pulse Width tBW

-

100

-

ns

COUNT to EQUAL Delay, tCE

-

500

-

ns

COUNT to ZERO Delay, tCZ

-

300

-

ns

RESET Pulse Width, tRST

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

SCAN

INTERNAL OSC

OUTPUT

D4

INTERNAL

D3

(BCD AND

SEGMENT

ENABLE)

D2

D1

10µs TYP

FREE-RUNNING

D4

INTERNAL

(COMMON

D3

ANODE

DIGIT

STROBES)

D2

D1

400µs TYP

FREE-RUNNING

INTERDIGIT BLANK

FIGURE 1. MULTIPLEX TIMING

9-15

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