CD4515 4-bit Latch/4-16 Decoder

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The CD4514BC and CD4515BC are 4-to-16 line decoders with latched inputs implemented with CMOS circuits constructed with N- and P-channel enhancement mode transistors. CD4515 presents a logical “0” at the selected output. The input latches are R–S type flip-flops, which hold the last input data presented prior to the strobe transition from “1” to “0”. The CD4515 offers a wide array of features such as ESD protection, thermal overload protection, and a wide array of workable voltages. The IC is very simple to use and is easily interfaceable with CMOS, NMOS, and TTL

What is a Latch Circuit?

A latch is a device that can be used to store one bit of information. The latch is used to capture, or ‘latch’ the logic level which is present on the Data line when the clock input is high. For example, in the case of a d-type latch, If the data on the D line changes state while the clock pulse is high, then the output, Q, follows the input, D. When the CLK input falls to logic 0, the last state of the D input is trapped and held in the latch.

CD4515 Key Features

ide supply voltage range: 3.0V to 15V
High noise immunity: 0.45 VDD (typ.)
Low power TTL: fan out of 2
- compatibility: driving 74L
Low quiescent power dissipation:
- 0.025 µW/package @ 5.0 VDC
Single supply operation
Input impedance = 1012Ω typically
Plug-in replacement for MC14514, MC14515

CD4515 Pinout

Pin No	Pin Name	Description
1	STROBE	Strobe Pin
2	IN A	Input A of Line Decoder
3	IN B	Input B of Line Decoder
4	S7	Output 7 of Line Decoder
5	S6	Output 6 of Line Decoder
6	S5	Output 5 of Line Decoder
7	S4	Output 4 of Line Decoder
8	S3	Output 3 of Line Decoder
9	S1	Output 1 of Line Decoder
10	S2	Output 2 of Line Decoder
11	S0	Output 0 of Line Decoder
12	VSS	Source Supply
13	S13	Output 13 of Line Decoder
14	S12	Output 12 of Line Decoder
15	S15	Output 15 of Line Decoder
16	S14	Output 14 of Line Decoder
17	S9	Output 9 of Line Decoder
18	S8	Output 8 of Line Decoder
19	S11	Output 11 of Line Decoder
20	S10	Output 10 of Line Decoder
21	IN C	Input C of Line Decoder
22	IN D	Input D of Line Decoder
23	INHIBIT	Inhibit Pin
24	VDD	Drain Supply