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PDF HD74BC645A Data sheet ( Hoja de datos )
| Número de pieza | HD74BC645A | |
| Descripción | Octal Bus Transceivers | |
| Fabricantes | Renesas | |
| Logotipo |  |
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HD74BC645A
Octal Bus Transceivers With 3 State Outputs
REJ03D0291–0200Z
(Previous ADE-205-027 (Z))
Rev.2.00
Jul.16.2004
Description
The HD74BC645A provides high drivability and operation equal to or better than high speed bipolar standard logic IC
by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC.
When the frequency is 10 MHz. The device has eight bus transceivers with three state outputs in a 20 pin package.
Each device has an active low enable input (G) and a direction control input, DiR. When DiR is high, data flows from
the A inputs to the B outputs. When DiR is high, data flows from the B inputs to the A outputs. When enable inputs
(G) is high, disables both A and B ports by placing then in a high impedance.
Features
• Input/Output are at high impedance state when power supply is off.
• Input pins can be open, when not used, owing to built in input pull up circuit.
• Input is TTL level.
• Wide operating temperature range
Ta = –40 to +85°C.
• Ordering Information
Part Name
HD74BC645AFPEL
Package Type Package Code
Package
Abbreviation
SOP-20 pin (JEITA) FP-20DAV
FP
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Function Table
Control Inputs
G
L
L
H
H : High level
L : Low level
X : Immaterial
Z : High impedance
L
H
X
DIR
B data to A bus
A data to B bus
Z
Operation
Rev.2.00, Jul.16.2004, page 1 of 7
1 page  
HD74BC645A
Test Circuit
VCC
Input
Pulse
Generator
Zout = 50 Ω
VCC
G
A1 S1
B1
Output
CL =
50 pF
500 Ω
450 Ω
50 Ω
Scope
DIR
OPEN *4
7V
Notes:
1. CL includes probe and jig capacitance.
2. A2-B2 to A8-B8 are identical to above load circuit.
3. S1: Input-Output change switch.
4. Open: tPLH, tPHL, tZH tHZ
7 V: tZL, tLZ
Waveforms-1
Input
10 %
tr
90 %
1.5 V
tPLH
tf
90 %
1.5 V
10 %
tPHL
Output
1.5 V
1.5 V
3V
0V
VOH
VOL
Rev.2.00, Jul.16.2004, page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HD74BC645A.PDF ] | |
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