參數(shù)資料
型號(hào)： SN74AVCH20T245GR
廠商： TEXAS INSTRUMENTS INC
元件分類： 總線收發(fā)器
英文描述： AVC SERIES, DUAL 10-BIT TRANSCEIVER, TRUE OUTPUT, PDSO56
封裝： GREEN, PLASTIC, TSSOP-56
文件頁(yè)數(shù)： 12/21頁(yè)
文件大?。?/td> 601K
代理商： SN74AVCH20T245GR
SN74AVCH20T245
20BIT DUALSUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3STATE OUTPUTS
SCES567F MAY 2004 REVISED APRIL 2005
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74AVCH20T245 is designed for asynchronous communication between data buses. The device
transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable (OE) input can be used to disable the outputs so that the buses
are effectively isolated.
The SN74AVCH20T245 is designed so that the control (1DIR, 2DIR, 1OE, and 2OE) inputs are supplied by
VCCA.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The VCC isolation feature ensures that if either VCC input is at GND, both outputs are in the high-impedance
state. The bus-hold circuitry on the powered-up side always stays active.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
terminal assignments
12
34
5
6
A
1B1
1B2
1DIR
1OE
1A2
1A1
B
1B3
1B4
GND
1A4
1A3
C
1B5
1B6
VCCB
VCCA
1A6
1A5
D
1B7
1B8
GND
1A8
1A7
E
1B9
1B10
1A10
1A9
F
2B1
2B2
2A2
2A1
G
2B3
2B4
GND
2A4
2A3
H
2B5
2B6
VCCB
VCCA
2A6
2A5
J
2B7
2B8
GND
2A8
2A7
K
2B9
2B10
2DIR
2OE
2A10
2A9
FUNCTION TABLE
(each 10-bit section)
INPUTS
OPERATION
OE
DIR
OPERATION
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
GQL OR ZQL PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
2
13
4
6
5
K
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN74AVCH20T245KR 功能描述:總線收發(fā)器 20B DUAL SUPPLY Bus Transceiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
SN74AVCH20T245VR 功能描述:轉(zhuǎn)換 - 電壓電平 20B DUAL SUPPLY Bus Transceiver RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8
SN74AVCH24T245GRGR 功能描述:轉(zhuǎn)換 - 電壓電平 24B Dual-Supply Bus Trans RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8
SN74AVCH24T245ZRGR 功能描述:轉(zhuǎn)換 - 電壓電平 24B Dual-Supply Bus Trans RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8
SN74AVCH2T45DCTR 功能描述:轉(zhuǎn)換 - 電壓電平 DUALB DUAL SUPPLY Bus Transceiver RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8
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