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IC Pinouts / CD4511

CD4511 Pinout

CD4511 BCD-to-7-Segment Driver · BCD-to-7-segment decoder/latch/driver; directly drives common-cathode displays, with blanking and latch.

DIP-16 Logic 16 pins No backend · 100% client-side
B 1
C 2
LT(/LT) 3
BI(/BL) 4
LE 5
D 6
A 7
VSS(GND) 8
CD4511 DIP-16
16 VDD
15 f
14 g
13 a
12 b
11 c
10 d
9 e
PowerGNDInputOutputI/OControl
PinNameTypeFunction
1 B Input BCD input bit 1 (weight 2)
2 C Input BCD input bit 2 (weight 4)
3 LT · /LT Control Lamp test (active-low, all segments on)
4 BI · /BL Control Blanking (active-low, all segments off)
5 LE Control Latch enable (high latches the current value)
6 D Input BCD input bit 3 (weight 8, MSB)
7 A Input BCD input bit 0 (weight 1, LSB)
8 VSS · GND GND Ground
9 e Output Segment e output
10 d Output Segment d output
11 c Output Segment c output
12 b Output Segment b output
13 a Output Segment a output
14 g Output Segment g output
15 f Output Segment f output
16 VDD Power Supply + (3–18V)
How to · reading it

How to read the CD4511 pinout

  1. 01

    Find pin 1

    One end of the chip has a half-circle notch or a dot; with the notch facing up, the top-left pin is pin 1.

  2. 02

    Count counter-clockwise

    Count counter-clockwise from pin 1: go down the left side first, then up the right side from the bottom.

  3. 03

    Check the table below

    Look up each pin's function by number in the table below; power/ground are color-coded, and alternate-function signals are in parentheses.

FAQ

Frequently asked questions

Does the CD4511 drive common-cathode or common-anode displays?

Common-cathode (common pin to ground). A high output lights the corresponding segment. Common-anode displays need a 7447 (active-low outputs) or similar.

How do I connect LT / BI / LE if unused?

Tie LT and BI high (VDD, no test / no blanking) and LE low (live display, no latching).

Do I need current-limiting resistors?

Yes. Put a current-limiting resistor (typically a few hundred ohms) in series with each segment output before the matching display segment, to prevent overcurrent.

Data source

Pinout data comes from TI CD4511B datasheet (standard DIP-16 numbering). Refer to the actual device datasheet as authoritative for the pinout.

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