ST21S07A

2/10

PIN CONFIGURATION

PIN DESCRIPTION

PlN N°

(TSSP20)

PlN N°

(SO-16L)

SYMBOL

NAME AND FUNCTION

1

1

TERMPWR1 Termination Power 1: Should be connected to the SCSI TERMPWR line.

Must be decoupled with either a 2.2

µF or 4.7µF. See Fig. 2.

2

HS-GND

Heat Sink Ground: Internally connected to the mounting pad. Should be

either grounded or electrically isolated from the other circuitry.

32

R1

Signal Termination 1: 110

Ω Termination

43

R2

Signal Termination 2: 110

Ω Termination

54

R3

Signal Termination 3: 110

Ω Termination

65

R4

Signal Termination 4: 110

Ω Termination

76

R5

Signal Termination 5: 110

Ω Termination

8

HS-GND

Heat Sink Ground: Internally connected to the mounting pad. Should be

either grounded or electrically isolated from the other circuitry.

97

pin. Must be decoupoled with 4.7

µF capacitor as shown in Figure 2

10

8

GND

Ground: Signal groud: 0V

11

9

TERMPWR

Termination Power21: Should be connected to the SCSI TERMPWR line.

Must be decoupled with either a 2.2

µF or 4.7µF. See Fig. 2.

12

HS-GND

Heat Sink Ground: Internally connected to the mounting pad. Should be

either grounded or electrically isolated from the other circuitry.

13

10

R6

Signal Termination 6: 110

Ω Termination

14

11

R7

Signal Termination 7: 110

Ω Termination

15

12

R8

Signal Termination 8: 110

Ω Termination

16

13

R9

Signal Termination 9: 110

Ω Termination

17

14

NC

Not connected: Do not connect any signal to this pin

18

HS-GND

Heat Sink Ground: Internally connected to the mounting pad. Should be

either grounded or electrically isolated from the other circuitry.

19

15

pin. Must be decoupoled with 4.7

µF capacitor

20

16

PD

Power Down: When tied low, the ST21S07A enters a power down mode.

Contains an internal 60K pull-up. Strap low to deactivate the ST21S07A,

leave open circuited to activate the ST21S07A

SO-16L

TSSOP20