CDC339DBR Datasheet, PDF (1/13 Pages) Texas Instruments – CLOCK DRIVER WITH 3-STATE OUTPUTS

D Low Output Skew, Low Pulse Skew for
Clock-Distribution and Clock-Generation
Applications
D TTL-Compatible Inputs and Outputs
D Distributes One Clock Input to Eight
Outputs
− Four Same-Frequency Outputs
− Four Half-Frequency Outputs
D Distributed V_CC and Ground Pins Reduce
Switching Noise
D High-Drive Outputs (− 48-mA I_OH,
48-mA I_OL)
D State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
D Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages
CDC339
CLOCK DRIVER
WITH 3ĆSTATE OUTPUTS
SCAS331 − DECEMBER 1992 − REVISED MARCH 1994
DB OR DW PACKAGE
(TOP VIEW)
Y3 ₁
GND ₂
Y4 3
V_CC 4
OE 5
CLR 6
V_CC 7
Q4 8
GND 9
Q3 10
20 ^Y2
19 ^GND
18 Y1
17 V_CC
16 CLK
15 GND
14 V_CC
13 Q1
12 GND
11 Q2
description
The CDC339 is a high-performance, low-skew clock driver. It is specifically designed for applications requiring
synchronized output signals at both the primary clock frequency and one-half the primary clock frequency. The
four Y outputs switch in phase and at the same frequency as the clock (CLK) input. The four Q outputs switch
at one-half the frequency of CLK.
When the output-enable (OE) input is low and the clear (CLR) input is high, the Y outputs follow CLK and the
Q outputs toggle on low-to-high transitions of CLK. Taking CLR low asynchronously resets the Q outputs to the
low level. When OE is high, the outputs are in the high-impedance state.
The CDC339 is characterized for operation from − 40°C to 85°C.
FUNCTION TABLE
INPUTS
OUTPUTS
OE CLR CLK Y1−Y4 Q1−Q4
H
X
X
Z
Z
L
L
L
L
L
L
L
H
H
L
L
H
L
L
H
↑
L
Q0†
H
Q0†
† _{The level of the Q outputs before the}
indicated steady-state input conditions were
established.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC-ΙΙB is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  1994, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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