DS21S07A Datasheet, PDF (1/8 Pages) Maxim Integrated Products – SCSI Terminator

www.maxim-ic.com
GENERAL DESCRIPTION
Fast SCSI and Ultra SCSI require the use of active
terminations at both ends of every cable segment in a
SCSI system with single-ended drivers and receivers.
The DS21S07A SCSI terminator, which is fully
compliant with these standards, enables the designer
to gain the benefits of active termination: greater
immunity to voltage drops on the TERMPWR
(TERMination PoWeR) line, enhanced high-level
noise immunity, intrinsic TERMPWR decoupling,
and very low quiescent current consumption. The
DS21S07A integrates a regulator and nine precise
switched 110Ω termination resistors into a
monolithic IC. The DS21S07A can be electrically
isolated from the SCSI bus without physical removal
from the SCSI device.
FEATURES
Fully Compliant with SCSI-1, Fast SCSI, and
Ultra SCSI
Backward Compatible to the DS2107 and
DS2107A
Provides Active Termination for Nine Signal
Lines
Laser-Trimmed 110Ω Termination Resistors
Have 2% Tolerance
Low Drop-Out Voltage Regulator
Power-Down Mode Isolates Termination
Resistors from the Bus
SCSI Bus Hot Plug Compatible
Fully Supports Actively Negated SCSI Signals
On-Board Thermal Shutdown Circuitry
16-Pin Plastic SO (DS21S07AS) and 20-Pin
Plastic TSSOP (Thin Shrink Small Outline
Package) (DS21S07AE)
DS21S07A
SCSI Terminator
PIN CONFIGURATIONS
ACTUAL FOOTPRINT SIZE
0.41"
0.26"
0.41"
DS21S07AS
0.27"
DS21S07AE
ORDERING INFORMATION
PART
VOLTAGE PIN-
TOP
(V) PACKAGE MARK
DS21S07AS
5 16 SO
DS21T07S
DS21S07AS+
5 16 SO
DS21T07S
DS21S07AS/T&R
5 16 SO
DS21T07S
DS21S07AS+T&R 5 16SO
DS21T07S
DS21S07AE
5 20 TSSOP DS21T07E
DS21S07AE/T&R
5
20 TSSOP DS21T07E
+ Denotes lead-free package. The top mark includes a “+" on
lead-free packages.
Note: All devices are specified over the 0°C to +70°C operating
temperature range.
1 of 5
REV: 022106