TIL306, TIL307

NUMERIC DISPLAYS WITH LOGIC

SLBS001 – D1034, JUNE 1982 – REVISED SEPTEMBER 1992

POST OFFICE BOX 655303

4

Terminal Functions

PIN

DESCRIPTION

NAME

NO.

DESCRIPTION

BLANKING Input (BI)

14

When high, will blank (turn off) the entire display and force RBO low. Must be low for normal display. May

be pulsed to implement intensity control of the display.

CLEAR Input (CLR)

12

When low, resets and holds counter at 0. Must be high for normal counting.

CLOCK Input (CLK)

15

Each positive-going transition will increment the counter provided that the circuit is in the normal counting

mode (serial and parallel count enable inputs low, clear input high).

DECIMAL POINT

Input (DP)

13

Must be high to display decimal point. The decimal point is not displayed when this input is low or when the

display is blanked.

LATCH Outputs (QA,

QB, QC, QD)

4, 1, 2, 3

The BCD data that drives the decoder can be stored in the 4-bit latch and is available at these outputs for

driving other logic and/or processors. The binary weights of the outputs are: QA = 1, QB = 2, QC = 4,

QD = 8.

LATCH STROBE

Input (LS)

5

When low, data in latches follow the data in the counter. When high, the data in the latches are held constant,

and the counter may be operated independently.

MAX-COUNT Output

7

Will go low when the counter is at 9 and serial count enable input is low. Will return high when the counter

changes to 0 and will remain high during counts 1 through 8. Will remain high (inhibited) as long as serial

count enable input is high.

PARALLEL Count

Enable Input (PCEI)

9

Must be low for normal counting mode. When high, counter will be inhibited. Logic level must not be changed

when the clock is low.

RIPPLE-BLANKING

Input (RBI)

6

When the data in the latches is BCD 0, a low input will blank the entire display and force the RBO low. This

input has no effect if the data in the latches is other than 0.

RIPPLE-BLANKING

Output (RBO)

11

Supplies ripple-blanking information for the ripple-blanking input of the next decade. Provides a low if BI is

high, or if RBI is low and the data in the latches is BCD 0; otherwise, this output is high. This pin has a resistive

pullup circuit suitable for performing a wire-AND function with any open-collector output. Whenever this pin

is low, the entire display will be blanked; therefore, this pin may be used as an active-low blanking input.

SERIAL Count

Enable Input (SCEI)

10

Must be low for normal counting mode, also must be low to enable maximum count output to go low. When

high, counter will be inhibited and maximum count output will be driven high. Logic level must not be changed

when the clock is low.

absolute maximum ratings over operating case temperature range (unless otherwise noted)

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage (see Note 1)

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0

°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

– 25

°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NOTES: 1. Voltage values are with respect to network ground terminal.

2. Case temperature is the surface temperature of the plastic measured directly over the integrated circuit. Forced-air cooling may be

required to maintain this temperature.