DS2120B Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2120B Datasheet PDF : 10 Pages
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Table 1. PIN DESCRIPTION
DS2120
DS2120E 28-Pin TSSOP
PIN
NAME
1
2–5, 7–12,
18–21, 23–26
6, 22
VREF
RxP, RxN
HS_GND
13
ISO
14
GND
15
MSTR/SLV
16
DIFFSENSE
17
DIFF_CAP
27, 28
TPWR
DESCRIPTION
Regulator Output Voltage. 1.25V reference in LVD mode; must be
decoupled with a 4.7µF cap.
Signal Termination. Connect to SCSI bus signal lines.
Heat Sink Ground. Internally connected to the mounting pad. Should be
connected to ground.
Isolation. When pulled high, terminating resistors and biasing current sources
are isolated from the SCSI bus.
Signal Ground.
Master/Slave. Mode select for the noncontrolling terminator. When pulled
high (MSTR), the DIFFSENS driver is enabled.
DIFFSENSE. Output to drive the SCSI bus DIFFSENS line.
DIFFSENSE Capacitor. Connect a 0.1µF capacitor for DIFFSENSE filter.
Input to detect the type of device (differential or single -ended) on the SCSI
bus.
Termination Power. Connect to the SCSI TERMPWR line and decouple with
2.2µF capacitor.
DS2120B 36-Pin SSOP
PIN
NAME
1
VREF
2, 3, 33, 35
4–7, 11–16,
22–25, 29–32
8–10, 26–28
NC
RxP, RxN
HS_GND
17
ISO
18
GND
19
MSTR/SLV
20
DIFFSENSE
21
DIFF_CAP
34
LVD
36
TPWR
DESCRIPTION
Regulator Output Voltage. 1.25V reference in LVD mode; must be
decoupled with a 4.7µF cap.
No Connect. Do not connect pins.
Signal Termination. Connect to SCSI bus signal lines.
Heat Sink Ground. Internally connected to the mounting pad. Should be
connected to ground.
Isolation. When pulled high, terminating resistors and biasing current sources
are isolated from the SCSI bus.
Signal Ground.
Master/Slave. Mode select for the noncontrolling terminator. When pulled
high (MSTR), the DIFFSENS driver is enabled.
DIFFSENSE. Output to drive the SCSI bus DIFFSENS line.
DIFFSENSE Capacitor. Connect a 0.1µF capacitor for DIFFSENSE filter.
Input to detect the type of device (differential or single ended) on the SCSI
bus.
Low-Voltage Differential. Output of DIFFSENSE receiver; output high
indicates LVD bus operation .
Termination Power. Connect to the SCSI TERMPWR line and decouple with
2.2µF capacitor.
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