20-Bit Buffers/Line Drivers
CY74FCT16827T
CY74FCT162827T
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
SCCS064 - August 1994 - Revised March 2000
Copyright
2000, Texas Instruments Incorporated
1CY74FCT162827T
Features
FCT-E speed at 3.2 ns
Power-off disable outputs permits live insertion
Edge-rate control circuitry for significantly improved
noise characteristics
Typical output skew < 250 ps
ESD > 2000V
TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
Industrial temperature range of
-
40C to +85C
V
CC
= 5V
10%
CY74FCT16827T Features:
64 mA sink current, 32 mA source current
Typical V
OLP
(ground bounce) <1.0V at V
CC
= 5V,
T
A
= 25C
CY74FCT162827T Features:
Balanced 24 mA output drivers
Reduced system switching noise
Typical V
OLP
(ground bounce) <0.6V at V
CC
= 5V,
T
A
= 25C
Functional Description
The CY74FCT16827T 20-bit buffer/line driver and the
CY74FCT162827T
20-bit
buffer/line
driver
provide
high-performance bus interface buffering for wide data/address
paths or buses carrying parity. These parts can be used as a single
20-bit buffer or two 10-bit buffers. Each 10-bit buffer has a pair of
NANDed OE for increased flexibility. The outputs are designed with
a power-off disable feature to allow for live insertion of boards.
The
CY74FCT16827T
is
ideally
suited
for
driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162827T has 24-mA balanced output drivers
with current-limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for
minimal undershoot and reduced ground bounce. The
CY74FCT162827T is ideal for driving transmission lines.
GND
Logic Block Diagrams
Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
36
35
1
OE
1
34
SSOP/TSSOP
Top View
1
Y
1
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
1
A
1
1
OE
1
1
Y
1
1
Y
2
1
Y
3
1
Y
4
1
A
1
1
A
2
1
A
3
1
A
4
1
OE
2
GND
GND
V
CC
2
Y
3
2
Y
4
2
Y
1
2
Y
2
1
A
6
V
CC
GND
GND
2
OE
1
FCT16827-1
1
OE
2
TO 9 OTHER CHANNELS
2
A
1
2
OE
1
TO 9 OTHER CHANNELS
2
OE
2
2
Y
1
1
Y
5
1
Y
6
1
Y
7
1
Y
8
1
Y
9
1
Y
10
2
Y
5
2
Y
9
2
Y
7
2
Y
8
V
CC
2
Y
6
2
Y
10
GND
25
26
27
28
55
54
53
52
51
50
49
56
1
A
5
1
A
7
1
A
9
1
A
8
1
A
10
2
A
3
2
A
4
2
A
2
GND
2
A
5
2
A
9
2
A
7
2
A
8
V
CC
2
A
6
2
A
10
2
A
1
GND
2
OE
2
FCT16827-2
FCT16827-3
CY74FCT16827T
CY74FCT162827T
2
Maximum Ratings
[2, 3]
(Above which the useful life may be impaired. For user
guidelines, not tested.)
Storage Temperature ...............................
-
55
C to +125
C
Ambient Temperature with
Power Applied..........................................
-
55
C to +125
C
DC Input Voltage
.................................................-
0.5V to +7.0V
DC Output Voltage
..............................................-
0.5V to +7.0V
DC Output Current
(Maximum Sink Current/Pin)
...........................-
60 to +120 mA
Power Dissipation .......................................................... 1.0W
Static Discharge Voltage............................................>2001V
(per MIL-STD-883, Method 3015)
Pin Description
Name
Description
OE
Output Enable Inputs (Active LOW)
A
Data Inputs
Y
Three-State Outputs
Function Table
[1]
Inputs
Outputs
OE
1
OE
2
A
Y
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
Operating Range
Range
Ambient
Temperature
V
CC
Industrial
-
40
C to +85
C
5V
10%
Electrical Characteristics
Over the Operating Range
Parameter
Description
Test Conditions
Min.
Typ.
[4]
Max.
Unit
V
IH
Input HIGH Voltage
2.0
V
V
IL
Input LOW Voltage
0.8
V
V
H
Input Hysteresis
[5]
100
mV
V
IK
Input Clamp Diode Voltage
V
CC
=Min., I
IN
=
-
18 mA
-
0.7
-
1.2
V
I
IH
Input HIGH Current
V
CC
=Max., V
I
=V
CC
1
A
I
IL
Input LOW Current
V
CC
=Max., V
I
=GND
1
A
I
OZH
High Impedance Output
Current (Three-State Output pins)
V
CC
=Max., V
OUT
=2.7V
1
A
I
OZL
High Impedance Output
Current (Three-State Output pins)
V
CC
=Max., V
OUT
=0.5V
1
A
I
OS
Short Circuit Current
[6]
V
CC
=Max., V
OUT
=GND
-
80
-
140
-
200
mA
I
O
Output Drive Current
[6]
V
CC
=Max., V
OUT
=2.5V
-
50
-
180
mA
I
OFF
Power-Off Disable
V
CC
=0V, V
OUT
4.5V
[7]
1
A
Output Drive Characteristics for CY74FCT16827T
Parameter
Description
Test Conditions
Min.
Typ.
[4]
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
=Min., I
OH
=
-
3 mA
2.5
3.5
V
V
CC
=Min., I
OH
=
-
15 mA
2.4
3.5
V
CC
=Min., I
OH
=
-
32 mA
2.0
3.0
V
OL
Output LOW Voltage
V
CC
=Min., I
OL
=64 mA
0.2
0.55
V
1.
H = HIGH Voltage Level. L = LOW Voltage Level. X = Don't Care.Z = HIGH Impedance.
2.
Operation beyond the limits set forth may impair the useful life of the device. Unless noted, these limits are over the operating free-air temperature range.
3.
Unused inputs must always be connected to an appropriate logic voltage level, preferably either V
CC
or ground.
4.
Typical values are at V
CC
= 5.0V, T
A
= +25C ambient.
5.
This parameter is specified but not tested.
6.
Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, I
OS
tests should be performed last.
7.
Tested at +25C.
CY74FCT16827T
CY74FCT162827T
3
Output Drive Characteristics for CY74FCT162827T
Parameter
Description
Test Conditions
Min.
Typ.
[4]
Max.
Unit
I
ODL
Output LOW Current
[6]
V
CC
=5V, V
IN
=V
IH
or V
IL
, V
OUT
=1.5V
60
115
150
mA
I
ODH
Output HIGH Current
[6]
V
CC
=5V, V
IN
=V
IH
or V
IL
, V
OUT
=1.5V
-
60
-
115
-
150
mA
V
OH
Output HIGH Voltage
V
CC
=Min., I
OH
=
-
24 mA
2.4
3.3
V
V
OL
Output LOW Voltage
V
CC
=Min., I
OL
=24 mA
0.3
0.55
V
Capacitance
[5]
(T
A
= +25C, f = 1.0 MHz)
Parameter
Description
Test Conditions
Typ.
[4]
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
4.5
6.0
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8.0
pF
Power Supply Characteristics
Parameter
Description
Test Conditions
Min.
Typ.
[4]
Max.
Unit
I
CC
Quiescent Power Supply
Current
V
CC
=Max.
V
IN
<0.2V,
V
IN
>V
CC
-
0.2V
--
5
500
A
I
CC
Quiescent Power Supply
Current (TTL inputs HIGH)
V
CC
=Max.
V
IN
=3.4V
[8]
--
0.5
1.5
mA
I
CCD
Dynamic Power Supply
Current
[9]
V
CC
=Max.,
One Input Toggling,
50% Duty Cycle,
Outputs Open,
OE
1
=OE
2
=GND,
V
IN
=V
CC
or
V
IN
=GND
--
60
100
A/MHz
I
C
Total Power Supply Current
[10]
V
CC
=Max.,
f
1
=10 MHz,
50% Duty Cycle,
Outputs Open,
One Bit Toggling,
OE
1
=OE
2
=GND
V
IN
=V
CC
or
V
IN
=GND
--
0.6
1.5
mA
V
IN
=3.4V or
V
IN
=GND
--
0.9
2.3
V
CC
=Max.,
f
1
=2.5 MHz,
50% Duty Cycle,
Outputs Open,
Twenty Bits Toggling,
OE
1
=OE
2
=GND
V
IN
=V
CC
or
V
IN
=GND
--
3.0
5.5
[11]
V
IN
=3.4V or
V
IN
=GND
--
8.0
20.5
[11]
Notes:
8.
Per TTL driven input (V
IN
=3.4V); all other inputs at V
CC
or GND.
9.
This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
10. I
C
=
I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
=
I
CC
+
I
CC
D
H
N
T
+I
CCD
(f
0
/2 + f
1
N
1
)
I
CC
=
Quiescent Current with CMOS input levels
I
CC
=
Power Supply Current for a TTL HIGH input (V
IN
=3.4V)
D
H
=
Duty Cycle for TTL inputs HIGH
N
T
=
Number of TTL inputs at D
H
I
CCD
=
Dynamic Current caused by an input transition pair (HLH or LHL)
f
0
=
Clock frequency for registered devices, otherwise zero
f
1
=
Input signal frequency
N
1
=
Number of inputs changing at f
1
All currents are in milliamps and all frequencies are in megahertz.
11. Values for these conditions are examples of the I
CC
formula. These limits are specified but not tested.
CY74FCT16827T
CY74FCT162827T
4
Switching Characteristics
Over the Operating Range
[12]
CY74FCT16827AT
CY74FCT162827AT
CY74FCT162827BT
Parameter
Description
Condition
[13]
Min.
Max.
Min.
Max.
Unit
Fig. No.
[13]
t
PLH
t
PHL
Propagation Delay
A to Y
C
L
=50 pF
R
L
=500
1.5
8.0
1.5
5.0
ns
1, 3
C
L
=300 pF
R
L
=500
1.5
15.0
1.5
13.0
t
PZH
t
PZL
Output Enable Time
OE to Y
C
L
=50 pF
R
L
=500
1.5
12.0
1.5
8.0
ns
1, 7, 8
C
L
=300 pF
R
L
=500
1.5
23.0
1.5
15.0
t
PHZ
t
PLZ
Output Disable Time
OE to Y
C
L
=5 pF
R
L
=500
1.5
9.0
1.5
6.0
ns
1, 7, 8
C
L
=50 pF
R
L
=500
1.5
10.0
1.5
7.0
t
SK(O)
Output Skew
[14]
--
0.5
--
0.5
ns
--
CY74FCT16827CT
CY74FCT162827CT
CY74FCT16827ET
CY74FCT162827ET
Parameter
Description
Condition
[12]
Min.
Max.
Min.
Max.
Unit
Fig. No.
[13]
t
PLH
t
PHL
Propagation Delay
A to Y
C
L
=50 pF
R
L
=500
1.5
4.2
1.5
3.2
ns
1, 3
C
L
=300 pF
R
L
=500
1.5
10.0
1.5
7.0
t
PZH
t
PZL
Output Enable Time
OE to Y
C
L
=50 pF
R
L
=500
1.5
5.6
1.5
4.8
ns
1, 7, 8
C
L
=300 pF
R
L
=500
1.5
14.0
1.5
9.0
t
PHZ
t
PLZ
Output Disable Time
OE to Y
C
L
=5 pF
R
L
=500
1.5
5.7
1.5
4.0
ns
1, 7, 8
C
L
=50 pF
R
L
=500
1.5
6.0
1.5
4.0
t
SK(O)
Output Skew
[14]
--
0.5
--
0.5
ns
--
Notes:
12. Minimum limits are specified but not tested on Propagation Delays.
13. See "Parameter Measurement Information" in the General Information section.
14. Skew between any two outputs of the same package switching in the same direction. This parameter is ensured by design.
CY74FCT16827T
CY74FCT162827T
5
Document #: 38
-
00393C
Ordering Information CY74FCT16827
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
3.2
CY74FCT16827ETPACT
Z56
56-Lead (240-Mil) TSSOP
Industrial
CY74FCT16827ETPVC/PVCT
O56
56-Lead (300-Mil) SSOP
4.2
CY74FCT16827CTPACT
Z56
56-Lead (240-Mil) TSSOP
Industrial
CY74FCT16827CTPVC/PVCT
O56
56-Lead (300-Mil) SSOP
8.0
CY74FCT16827ATPVC/PVCT
Z56
56-Lead (240-Mil) TSSOP
Industrial
Ordering Information CY74FCT162827
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
3.2
74FCT162827ETPACT
Z56
56-Lead (240-Mil) TSSOP
Industrial
CY74FCT162827ETPVC
O56
56-Lead (300-Mil) SSOP
74FCT162827ETPVCT
O56
56-Lead (300-Mil) SSOP
4.2
74FCT162827CTPACT
Z56
56-Lead (240-Mil) TSSOP
Industrial
CY74FCT162827CTPVC
Z56
56-Lead (240-Mil) TSSOP
74FCT162827CTPVCT
Z56
56-Lead (240-Mil) TSSOP
5.0
CY74FCT162827BTPVC
O56
56-Lead (300-Mil) SSOP
Industrial
74FCT162827BTPVCT
O56
56-Lead (300-Mil) SSOP
8.0
CY74FCT162827ATPVC
O56
56-Lead (300-Mil) SSOP
Industrial
74FCT162827ATPVCT
O56
56-Lead (300-Mil) SSOP
CY74FCT16827T
CY74FCT162827T
6
Package Diagrams
56-Lead Shrunk Small Outline Package O56
56-Lead Thin Shrunk Small Outline Package Z56
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Copyright
2000, Texas Instruments Incorporated
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