- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381723 > DS21T16 (Maxim Integrated Products, Inc.) SCSI Terminator(SCSI終端) PDF資料下載
參數(shù)資料
| 型號： | DS21T16 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | SCSI Terminator(SCSI終端) |
| 中文描述： | SCSI端接（的SCSI終端） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 80K |
| 代理商： | DS21T16 |
DS21T16
SCSI Terminator
DS21T16
PRODUCT PREVIEW
063098 1/6
FEATURES
Fully compliant with SCSI–1, Fast SCSI and Ultra
SCSI
Pin compatible to the DS2107AE and DS21S07AE
Provides active termination for nine signal lines
Supports TERMPWR 2.7V – 5.50V
Low dropout voltage regulator
Power–down mode isolates termination resistors
from the bus
SCSI bus hot–plug compatible
Fully supports actively negated SCSI signals
Onboard thermal shutdown circuitry
20–pin plastic TSSOP (Thin Shrink Small Outline
Package) (DS21T16E)
PIN ASSIGNMENT
7
1
2
3
4
5
6
8
9
DS21T16E 20–PIN TSSOP (173 MIL)
TERMPWR1
R1
R2
R3
R4
R5
VREF1
GND
PD
VREF2
NC
R9
R8
R7
R6
TERMPWR2
HS–GND
HS–GND
HS–GND
HS–GND
10
11
12
13
14
15
16
17
18
19
20
DESCRIPTION
Fast SCSI and Ultra SCSI require the use of active ter-
minations at both ends of every cable segment in a
SCSI system with single–ended drivers and receivers.
The DS21T16 SCSI Terminator, which is fully compliant
with these standards, enables the designer to gain the
benefits of active termination: greater immunity to volt-
age drops on the TERMPWR (TERMination PoWeR)
line, enhanced high–level noise immunity, intrinsic
TERMPWR decoupling, and very low quiescent current
consumption. The DS21T16 integrates a regulator and
nine precise switched 110 ohms termination resistors
into a monolithic IC. The DS21T16 can be electrically
isolated from the SCSI bus without physical removal
from the SCSI device.
FUNCTIONAL DESCRIPTION
The DS21T16 consists of a bandgap reference, buffer
amplifier, and nine termination resistors (Figure 1). The
bandgap reference circuit produces a precise 2.55V
level which is fed to a buffer amplifier. The buffer pro-
duces a 2.7V level and is capable of sourcing at least
24 mA into each of the termination resistors when the
signal line is low (active). When the driver for a given
signal line turns off, the terminator will pull the signal line
to 2.7V (quiescent state). To handle actively negated
SCSI signals, the buffer can sink at least 200 mA, and
V
REF
will move less than 60 mV. When all lines settle in
the quiescent state, the regulator will consume about
2.5 mA. When the DS21T16 is put into power–down
mode by bringing PD low, the power–down circuitry will
turn off the transistors on each signal line. This will iso-
late the DS21T16 from the signal lines and effectively
remove it from the circuit. The power–down pin (PD)
has an internal 50K
pull–up resistor. To place the
DS21T16 into an active state, the PD pin should be left
open circuited. When installed on disk drives or RAID
system components, the DS21T16 will not affect the
SCSI bus during a hot plug operation.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2223 | EconoRAM(經(jīng)濟(jì)型RAM) |
| DS2224 | EconoRAM(經(jīng)濟(jì)型RAM) |
| DS2227 | Flexible NV SRAM Stik(靈活的非易失性SRAM) |
| DS2229 | Word-Wide 8Meg SRAM Stik(字寬度的8M SRAM) |
| DS2401 | Silicon Serial Number(硅串行數(shù)據(jù)) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS21-TB | 制造商:Thomas & Betts 功能描述:SGL GANG FS/FD CVR,STL, RND RCPT 制造商:Thomas & Betts 功能描述:Fittings Cover 1.405inch Steel |
| DS22 | 制造商:LUMILEDS 制造商全稱:LUMILEDS 功能描述:power light source Luxeon Ring |
| DS22 500G REEL | 制造商:Henkel Corporation / Multicore 功能描述:SOLDER WIRE SAVBIT 0.71MM 500G 制造商:Henkel Corporation / Multicore 功能描述:SOLDER WIRE, SAVBIT, 0.71MM, 500G 制造商:Henkel Corporation / Multicore 功能描述:SOLDER WIRE, SAVBIT, 0.71MM, 500G, External Diameter - Metric:0.71mm, External Diameter - Imperial:0.028", Solder Alloy:(Not Available), Melting Temperature:215C, Weight:500g, SVHC:No SVHC (20-Jun-2013), Bit Temperature:335C, , RoHS Compliant: No |
| DS220 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS2200 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Scanner Laser ultra compatto |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。