UPD7759C データシートの表示（PDF） - NEC => Renesas Technology

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UPD7759C

ADPCM SPEECH SYNTHESIZER LSIs

NEC => Renesas Technology 

µPD7759

1. PIN FUNCTIONS

5

1.1 COMMON FUNCTION TO ALL MODES

Pin

52-pin

40-pin

(Abbre-

QFP

DIP

I/O

viation) Pin No. Pin No.

Function

VDD

DRQ

6

40

—

Power supply (2.7 to 5.5 V)

24

14

Output Speech synthesis data request.

D/A converter reference current input.

The sink-load current input causes the output current of the

D/A converter to change.

REF

28

16

Input

The D/A converter reference current is passed to VDD via

a resistor.

In standby mode, REF is set to high impedance.

AVO

Analog speech signal output.

AVO outputs a unipolar sink-load current.

The output current is reduced to 0 when the µPD7759 is in the

standby mode.

29

17

Output

The output current of the D/A converter from AVO is changed

according to the input current from REF.

Maximum output current of the D/A converter is approx. the

34 times the REF input current.

Active-low BUSY signal output. When inputting ST signal,

it outputs a low level signal.

BUSY

30

18

Output

MD, ST and WR are invalid while BUSY is low.

In standby mode, BUSY is set to high impedance.

RESET

31

Reset input.

In standby mode, RESET must be at low level more than 12

19

Input clock cycles after clock oscillation becomes stable.

In operation mode, RESET must be at low level for 12 clock

cycles (oscillation clock).

GND

32

20

—

Ground.

X1

36

23

—

Ceramic resonator connection for generating a clock signal.

The 640 kHz ceramic resonator can be connected.

In standby mode, the µPD7759 outputs a low-level to X1 and

X2

37

24

—

a high-level to X2.

1, 7, 13,

14, 20, 26,

NC

—

27, 33, 39,

40, 46, 52

—

No Connection

3

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