DS2407

012099 20/31

DS2407 EQUIVALENT CIRCUIT Figure 10

5

µA

Typ.

100

Ω

MOSFET

DATA

GROUND

Q

Q

RESET

D

Q

D

Q

R

GROUND

10M

Ω

Typ.

“1”

PIO

ACTIVITY

LATCH

TO PIO

CONTROL

1–WIRE DATA

FROM PIO

CONTROL

EDGE

DETECTOR

CHANNEL

FLIP–FLOP

PIO CHANNEL

1–WIRE INTERFACE

BUS MASTER CIRCUIT Figure 11

The interface is reduced to the 5k

Ω pull–up resistor if one does not intend to program the EPROM cells.

BUS MASTER

TTL–Equivalent

Port Pins

5k

Ω

B) Standard TTL

5k

Ω

PROGRAMMING PULSE

12V

(10 mA min.)

BUS MASTER

DS5000 OR 8051 EQUIVALENT

Open Drain

Port Pin

A) Open Drain

12V

TO DATA CONNECTION

OF DS2506

5k

Ω

10k

Ω

10k

Ω

PGM

D

S

D

S

S

D

D

S

2N7000

2N7000

2N7000

470 pF

VP0300L

OR

VP0106N3

OR

BSS110

CAPACITOR ADDED TO REDUCE

COUPLING ON DATA LINE DUE TO

PROGRAMMING SIGNAL SWITCHING

TO DATA CONNECTION

OF DS2507

The diode and Programming Pulse circuit are not required if one does not intend to program the EPROM cells.