MC74HC4511 데이터 시트보기 (PDF) - Motorola => Freescale

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MC74HC4511

BCD-to-Seven-Segment Latch/Decoder/Display Driver

Motorola => Freescale 

MC74HC4511

FUNCTION TABLE

Inputs

Outputs

LE BI LT D C B A a b c d e f g

X X L XXXXHHHHHHH

X L H XXXXL L L L L L L

L H H L L L LHHHHHHL

L H H L L LHLHHL L L L

L H H L LHLHHLHHLH

L H H L LHHHHHHL LH

L H H LHL L LHHL LHH

L H H LHLHHLHHLHH

L H H LHHL L LHHHHH

L H H LHHHHHHL L L L

L H H HL L LHHHHHHH

L H H HL LHHHHL LHH

L H H HLHLLLLLLLL

L H H HLHHL L L L L L L

L H H HHL L L L L L L L L

L H H HHLHL L L L L L L

L H H HHHL L L L L L L L

L H H HHHHL L L L L L L

H H H XXXX

*

* = Depends upon the BCD code previously applied while LE was at a low level.

Display

8

Blank

0

1

2

3

4

5

6

7

8

9

Blank

Blank

Blank

Blank

Blank

Blank

*

PIN DESCRIPTIONS

INPUTS

A, B, C, D (Pins 7, 1, 2, 6)

BCD inputs. A (pin 7) is the least significant bit and D (pin

6) is the most significant bit. Hexadecimal code A–F at these

inputs causes the outputs to assume a low level, offering an

alternate method of blanking the display.

OUTPUTS

a, b, c, d, e, f, g (Pins 13, 12, 11, 10, 9, 15, 14)

Decoded, buffered seven–segment display–driver out-

puts. These outputs, unlike the MC14511, have CMOS driv-

ers, which produce typical CMOS output voltage levels.

These outputs are connected to various displays as shown in

Figure 7.

CONTROL INPUTS

BI (Pin 4)

Active–low display blanking input. A low level on this input

will cause all outputs to be held low, thereby blanking the dis-

play. LT is the only input that overrides the BI input.

LT (Pin 3)

Active–low lamp test. A low level on this input causes all

outputs to assume a high level. This input allows the user to

test all segments of a display with a single control input. This

input is independent of all other inputs.

LE (Pin 5)

Latch enable input. This input controls the 4–bit transpar-

ent latch. A high level on this input latches the code present

at the A, B, C and D inputs, a low level allows the code to be

transmitted through the latch to the decoder.

High–Speed CMOS Logic Data

5

DL129 — Rev 6

MOTOROLA

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