DS21S07A 查看數據表（PDF） - Maxim Integrated

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DS21S07A

SCSI Terminator

Maxim Integrated 

DS21S087A

Table 1. Pin Description

PIN

TSSOP SO

NAME

1

1

TERMPWR1

2, 8, 12,

18

—

HS-GND

FUNCTION

Termination Power 1. Should be connected to the SCSI

TERMPWR line. Must be decoupled with either a 2.2µF

capacitor or 4.7µF capacitor. See Figure 2.

Heat Sink Ground. Internally connected to the mounting pad.

Should be either grounded or electrically isolated from other

circuitry.

3–7,

2–6,

13–16 10–13

R1–R9

Signal Termination 1–9. 110Ω termination.

Reference Voltage 1. Must be externally connected directly to

9

7

VREF1

the VREF2 pin. Must be decoupled with a 4.7µF capacitor as

shown in Figure 2.

10

8

GND

Ground. 0V, signal ground.

Termination Power 2. Should be connected to the SCSI

11

9

TERMPWR2 TERMPWR line. Must be decoupled with either a 2.2µF

capacitor or 4.7µF capacitor. See Figure 2.

17

14

NC

No Connection. Do not connect any signal to this pin.

Reference Voltage 2. Must be externally connected directly to

19

15

VREF2

the VREF1 pin. Must be decoupled with a 4.7µF capacitor as

shown in Figure 2.

Active-Low Power-Down. When tied low, the DS21S07A

20

16

PD

enters a power-down mode. Contains an internal 50kΩ pullup

resistor. Strap low to deactivate the DS21S07A; leave open

circuited to activate the DS21S07A

4 of 8

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