MAXIMUM RATINGS

PARAMETER

SYMBOL

VALUE

UNITS

Storage Temperature

Tstg

-65 to +150

°C

-25 to +70

°C

Voltage (any pin to Vss) Vmax

-30 to +0.5

V

DC ELECTRICAL CHARACTERISTICS

otherwise specified.)

PARAMETER

SYM MIN

MAX

UNITS

Quescent Supply Current

-

-

-

-

(All Input Pins Tied to Vss)

(All Output Pins Left Open)

Vss = 4.75V

-

20

mA

Vss = 15V

-

25

mA

Input Capacitance All Inputs

Cin

-

10

pF

Hysteresis On Count Input

-

V

Noise Immunity All Other Inputs

-

V

-

V

Output Levels All Outputs

-

0.5

V

(All Output Pins Left Open)

Vss - 1

-

V

7 Segment Output Current

Source Current

0.3

-

mA

0.4

-

mA

2.0

-

mA

3.0

-

mA

Note: Limit Segment Source Current to 4.5mA max.

Vss = 4.75V, 25°C

-21

-

µA

Vss = 10V, 25°C

-17

-

µA

Vss = 15V, 25°C

-15

-

µA

Vss = 15V, 70°C

-10

-

µA

BCD, Zero Detect, Mainsignal and Presignal Output Current

Source Current

0.10

-

mA

0.13

-

mA

0.7

-

mA

2.5

-

mA

Note: Limit Segment Source Current to 4.5mA max.

Vss = 4.75V, 25°C

-7.5

-

µA

Vss = 10V, 25°C

-6.0

-

µA

Vss = 15V, 25°C

-5.5

-

µA

Vss = 15V, 70°C

-4.0

-

µA

Digit Select Output Current

Source Current

0.28

-

mA

0.35

-

mA

2.0

-

mA

7.0

-

mA

Note: Limit digit select current to 10mA.

Vss = 4.75V, 25°C

-15

-

µA

Vss = 10V, 25°C

-12

-

µA

Vss = 15V, 25°C

-11

-

µA

Vss = 15V, 70°C

-

µA

DYNAMIC ELECTRICAL CHARACTERISTICS

unless otherwise specified.)

PARAMETER

SYM

MIN

MAX

UNITS

Count Input Frequency

Vss = 4.75V

Fc

DC

250

kHz

Vss = 10V

Fc

DC

175

kHz

Vss = 15V

Fc

DC

125

kHz

Pulse Width

Vss = 4.75V

Tcw

2

-

µs

Vss = 10V

Tcw

2.8

-

µs

Vss = 15V

Tcw

4

-

µs

Rise Time

Tcr

-

∞

µs

Fall Time

Tcf

-

∞

µs

Scan Input Frequency

Fsc

DC

100

kHz

Divide Control

Set-Up Time

Tds

2

-

µs

Hold Time

Tdh

8

-

µs

Reset Pulse Width

**

Trpw

2

-

µs

Reset

Set Up Time

Trs

0

-

µs

Hold Time

Trh

6

-

µs

Inhibit Internal Reset

Set Up Time

Tis

0

-

µs

Hold Time

*

Tirh

3

-

µs

Preset Pulse Width

**

Tppw

2

-

µs

Preset Enable

Set Up Time

Tips

0

-

µs

Hold Time

*

Tiph

6

-

µs

Data Transfer Pulse Width

**

Tdtw

2

-

µs

Data Transfer

Set Up Time

Tdts

0

-

µs

Hold Time

Tdth

6

-

µs

Up/Down

Set Up Time

Tuds

0

-

µs

Hold Time

Tud

10

-

µs

Count Inhibit

Set Up Time

Tcs

2

-

µs

Hold Time

Tch

10

-

µs

Rise Time

Tdr

-

1.0

µs

Fall Time

Vss = 4.75V

Tdf

-

2.0

µs

Vss = 10V

Tdf

-

3.0

µs

Vss = 15V

Tdf

-

4.0

µs

Digit Select Outputs Guard Band Time

within 7 segment & BCD outputs

Tgb

0.5

-

µs

See Figure 3

Main Signal, Presignal, Zero Detect

Outputs delay with respect to positive

edge of Count Input

Tdo

-

3

µs

Set-Up and Hold times are defined with respect to positive edge of count

input except where indicated by asterisks.

plus 5µs past the next positive edge of count input.

applied when a count input is going positive. In that case the set-up and

hold times govern.

7055-012703-3

The information included herein is believed to be

accurate and reliable. However, LSI Computer Systems,

Inc. assumes no responsibilities for inaccuracies, nor for

any infringements of patent rights of others which may

result from its use.