TEXAS INSTRUMENTS CDC328 Technical data
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CDC328
1-LINE TO 6-LINE CLOCK DRIVER
WITH SELECTABLE POLARITY
SCBS116B – JANUARY 1991 – REVISED MARCH 1994
• Replaces SN74ABT328
• Low Output Skew for Clock-Distribution
and Clock-Generation Applications
• TTL-Compatible Inputs and Outputs
• Distributes One Clock Input to Six Clock
Outputs
• Polarity Control Selects True or
Complementary Outputs
• Distributed V
Switching Noise
• High-Drive Outputs (–15-mA I
and GND Pins Reduce
CC
OH
,
D OR DB PACKAGE
(TOP VIEW)
GND
GND
GND
1Y2
2Y1
2Y2
3Y
4Y
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
1Y1
1T
/C
V
CC
2T/C
A
V
CC
3T/C
4T
/C
9
64-mA IOL)
• State-of-the-Art
EPIC-ΙΙB
BiCMOS Design
Significantly Reduces Power Dissipation
• Package Options Include Plastic
Small-Outline (D) and Shrink Small-Outline
(DB) Packages
description
The CDC328 contains a clock-driver circuit that distributes one input signal to six outputs with minimum skew
for clock distribution. Through the use of the polarity-control inputs (T/C), various combinations of true and
complementary outputs can be obtained.
The CDC328 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
T/C A
L L L
L HH
H LH
H H L
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
12
A
15
1T/C
2T
3T/C
4T
13
/C
10
9
/C
N1
N2
N3
N4
OUTPUT
Y
1
1
2
2
3
4
16
1Y1
2
1Y2
3
2Y1
5
2Y2
6
3Y
8
4Y
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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1994, Texas Instruments Incorporated
2–1
CDC328
1-LINE TO 6-LINE CLOCK DRIVER
WITH SELECTABLE POLARITY
SCBS116B – JANUAR Y 1991 – REVISED MARCH 1994
logic diagram (positive logic)
1T
/C
/C
2T
A
3T
/C
/C
4T
15
13
12
10
9
16
1Y1
2
1Y2
3
2Y1
5
2Y2
6
3Y
8
4Y
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state
or power-off state, VO (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state, I
Input clamp current, I
Output clamp current, I
(V
< 0) –18 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
I
(V
< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OK
O
128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
Continuous total power dissipation at (or below) 25°C free-air temperature (see Note 2) 1000 mW. . . . . . . .
Storage temperature range, T
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. For operation above 25°C free-air temperature, derate to 478 mW at 85°C at the rate of 8.7 mW/°C.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions (see Note 3)
MIN NOM MAX UNIT
V
CC
V
IH
V
IL
V
I
I
OH
I
OL
∆t/∆v Input transition rise or fall rate 5 ns/V
f
clock
T
A
NOTE 3: Unused inputs must be held high or low.
Supply voltage 4.75 5 5.25 V
High-level input voltage 2 V
Low-level input voltage 0.8 V
Input voltage 0 V
High-level output current –15 mA
Low-level output current 64 mA
Input clock frequency 80 MHz
Operating free-air temperature –40 85 °C
CC
V
†
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
CDC328
I
CC
,
O
,
A
Any Y
ns
T/C
Any Y
ns
t
A
ns
A
Any Y
ns
t
A
ns
1-LINE TO 6-LINE CLOCK DRIVER
WITH SELECTABLE POLARITY
SCBS116B – JANUARY 1991 – REVISED MARCH 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
V
OH
V
OL
I
I
‡
I
O
CC
C
†
All typical values are at VCC = 5 V, TA = 25°C
‡
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
i
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (see Figures 1 and 2)
PARAMETER
t
PLH
t
PHL
t
PLH
t
PHL
sk(o)
t
r
t
f
VCC = 4.75 V, II = –18 mA –1.2 V
VCC = 4.75 V, IOH = –15 mA 2.5 V
VCC = 4.75 V, IOL = 64 mA 0.55 V
VCC = 5.25 V, VI = VCC or GND ±1 µA
VCC = 5.25 V, VO = 2.5 V –15 –100 mA
V
= 5.25 V, I
VI = VCC or GND
VI = 2.5 V or 0.5 V 3 pF
FROM
(INPUT)
= 0,
Any Y (same phase) 0.7
Any Y (any phase) 2.6
Outputs high 50 µA
Outputs low 20 30 mA
TO
(OUTPUT)
MIN TYP MAX UNIT
1.7 7
1.5 5.4
1.5 8
1.4 6.6
1.2 ns
0.5 ns
switching characteristics, VCC = 5 V ± 0.25 V, T
PARAMETER
t
PLH
t
PHL
sk(o)
FROM
(INPUT)
= 25°C to 70°C (see Figures 1 and 2)
A
TO
(OUTPUT)
Any Y (same phase) 0.7
Any Y (any phase) 2.1
MIN MAX UNIT
2.1 6.1
1.7 4.8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–3
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