16-Bit Transceivers
CY74FCT16245T
CY74FCT162245T
CY74FCT162H245T
SCCS026 - July 1994 - Revised March 2000
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
Copyright © 2000, Texas Instruments Incorporated
1CY74FCT16445T/2
H245T
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 –40˚C to +85˚C
•VCC = 5V ± 10%
CY74FCT16245T Features:
•64 mA sink current, 32 mA source current
•Typical VOLP (ground bounce)<1.0V at VCC = 5V,
TA = 25˚C
CY74FCT162245T Features:
•Balanced output drivers: 24 mA
•Reduced system switching noise
•Typical VOLP (ground bounce) <0.6V at VCC = 5V,
TA= 25˚C
CY74FCT162H245T Features:
•Bus hold on data inputs
•Eliminates the need for external pull-up or pull-down
resistors
Functional Description
These 16-bit transceivers are designed for use in bidirectional
synchronous communication between two buses, where high
speed and low power are required. With the exception of the
CY74FCT16245T, these devices can be operated either as
two independent octals or a single 16-bit transceiver. Direction
of data flow is controlled by (DIR), the Output Enable (OE)
transfers data when LOW and isolates the buses when HIGH.
The output buffers are designed with power off disable capa-
bility to allow for live insertion of boards.
The CY74FCT16245T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162245T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for mini-
mal undershoot and reduced ground bounce. The
CY74FCT162245T is ideal for driving transmission lines.
TheCY74FCT162H245Tisa24-mAbalancedoutputpartthat
has bus hold on the data inputs. The device retains the input’s
last state whenever the input goes to high impedance. This
eliminates the need for pull-up/down resistors and prevents
floating inputs.
GND
LogicBlock Diagrams CY74FCT16245T,CY74FCT162245T,
CY74FCT162H245T Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
25
26
27
28
36
35
1DIR
34
SSOP/TSSOP
Top View
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
1B1
1B2
1B3
1B4
1A1
1A2
1A3
1A4
1OE
GND
GND
VCC
1B7
1B8
1B5
1B6
1A5
1A6
1A7
1A8
VCC
GND
GND
2B3
2B4
2B1
2B2
2A1
2A2
2A3
2A4
GND
GND
VCC
2B7
2B8
2B5
2B6
2A5
2A6
2A7
2A8
VCC
GND
2DIR 2OE
FCT16245–1
1A1
1A2
1A3
1A4
1A5
1A6
1A7
1OE
1B1
1B2
1B3
1B4
1B5
1B6
1B7
1DIR
1A8
1B8
FCT16245–2
2A1
2A2
2A3
2A4
2A5
2A6
2A7
2OE
2B1
2B2
2B3
2B4
2B5
2B6
2B7
2DIR
2A8
2B8FCT16245–3
16245T
162245T
162H245T
CY74FCT16245
T
CY74FCT162245
T
CY74FCT162H245
T
2
Maximum Ratings[3, 4]
(Above which the useful life may be impaired. For user
guidelines, not tested.)
Storage Temperature ........................Com’l -55°C to +125°C
Ambient Temperature with
Power Applied....................................Com’l -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)
Notes:
1. On CY74FCT162H245T these pins have bus hold.
2. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care. Z = High Impedance.
3. Operationbeyondthelimitssetforthmayimpairthe usefullifeofthe device.Unlessotherwise noted,theselimitsareovertheoperatingfree-air temperaturerange.
4. Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground.
Pin Description
Name Description
OE Three-State Output Enable Inputs (Active LOW)
DIR Direction Control
A Inputs or Three-State Outputs[1]
B Inputs or Three-State Outputs[1]
Function Table[2]
Inputs
OutputsOE DIR
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z State Operating Range
Range Ambient
Temperature VCC
Industrial –40°C to +85°C 5V ± 10%
Electrical Characteristics Over the Operating Range
Parameter Description Test Conditions Min. Typ.[5] Max. Unit
VIH Input HIGH Voltage 2.0 V
VIL Input LOW Voltage 0.8 V
VHInput Hysteresis[6] 100 mV
VIK Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 –1.2 V
IIH Input HIGH Current Standard VCC=Max., VI=VCC ±1µA
Bus Hold ±100
IIL Input LOW Current Standard VCC=Max., VI=GND ±1µA
Bus Hold ±100 µA
IBBH
IBBL Bus Hold Sustain Current on Bus Hold Input[7] VCC=Min. VI=2.0V –50 µA
VI=0.8V +50
IBHHO
IBHLO Bus Hold Overdrive Current on Bus Hold Input[7] VCC=Max., VI=1.5V TBD mA
IOZH High Impedance Output Current
(Three-State Output pins) VCC=Max., VOUT=2.7V ±1µA
IOZL High Impedance Output Current
(Three-State Output pins) VCC=Max., VOUT=0.5V ±1µA
IOS Short Circuit Current[8] VCC=Max., VOUT=GND –80 –140 –200 mA
IOOutput Drive Current[8] VCC=Max., VOUT=2.5V –50 –180 mA
IOFF Power-Off Disable VCC=0V, VOUT≤4.5V[9] ±1µA
CY74FCT16245
T
CY74FCT162245
T
CY74FCT162H245
T
3
Output Drive Characteristics for CY74FCT16245T
Parameter Description Test Conditions Min. Typ.[5] Max. Unit
VOH Output HIGH Voltage VCC=Min., IOH=–3 mA 2.5 3.5 V
VCC=Min., IOH=–15 mA 2.4 3.5 V
VCC=Min., IOH=–32 mA 2.0 3.0 V
VOL Output LOW Voltage VCC=Min., IOL=64 mA 0.2 0.55 V
Output Drive Characteristics for CY74FCT162245T, CY74FCT162H245T
Parameter Description Test Conditions Min. Typ.[5] Max. Unit
IODL Output LOW Current[8] VCC=5V, VIN=VIH or VIL, VOUT=1.5V 60 115 150 mA
IODH Output HIGH Current[8] VCC=5V, VIN=VIH or VIL, VOUT=1.5V –60 –115 –150 mA
VOH Output HIGH Voltage VCC=Min., IOH=–24 mA 2.4 3.3 V
VOL Output LOW Voltage VCC=Min., IOL=24 mA 0.3 0.55 V
Notes:
5. Typical values are at VCC=5.0V, TA=+25˚C ambient.
6. This parameter is specified but not tested.
7. Pins with bus hold are described in Pin Description.
8. 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, IOS tests should be performed last.
9. Tested at +25˚C.
Capacitance[6] (TA = +25˚C, f = 1.0 MHz)
Parameter Description Test Conditions Typ.[5] Max. Unit
CIN Input Capacitance VIN = 0V 4.5 6.0 pF
COUT Output Capacitance VOUT = 0V 5.5 8.0 pF
CY74FCT16245
T
CY74FCT162245
T
CY74FCT162H245
T
4
Power Supply Characteristics
Parameter Description Test Conditions Typ.[5] Max. Unit
ICC Quiescent Power Supply Current VCC=Max. VIN<0.2V,
VIN>VCC-0.2V 5 500 µA
∆ICC Quiescent Power Supply Current
(TTL inputs HIGH) VCC=Max. VIN=3.4V[10] 0.5 1.5 mA
ICCD Dynamic Power Supply
Current[11] VCC=Max., One Input Toggling,
50%DutyCycle,OutputsOpen,
OE=DIR=GND
VIN=VCC or
VIN=GND 60 100 µA/MHz
ICTotal Power Supply Current[12] VCC=Max., f1=10 MHz,
50%DutyCycle,OutputsOpen,
One Bit Toggling,
OE=DIR=GND
VIN=VCC or
VIN=GND 0.6 1.5 mA
VIN=3.4V or
VIN=GND 0.9 2.3 mA
VCC=Max., f1=2.5 MHz, 50%
Duty Cycle, Outputs Open,
Sixteen Bits Toggling,
OE=DIR=GND
VIN=VCC or
VIN=GND 2.4 4.5[13] mA
VIN=3.4V or
VIN=GND 6.4 16.5[13] mA
Notes:
10. Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND.
11. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
12. IC=I
QUIESCENT + IINPUTS + IDYNAMIC
IC=I
CC+∆ICCDHNT+ICCD(f0/2 + f1N1)
ICC = Quiescent Current with CMOS input levels
∆ICC = Power Supply Current for a TTL HIGH input (VIN=3.4V)
DH= Duty Cycle for TTL inputs HIGH
NT= Number of TTL inputs at DH
ICCD = Dynamic Current caused by an input transition pair (HLH or LHL)
f0= Clock frequency for registered devices, otherwise zero
f1= Input signal frequency
N1= Number of inputs changing at f1
All currents are in milliamps and all frequencies are in megahertz.
13. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.
CY74FCT16245
T
CY74FCT162245
T
CY74FCT162H245
T
5
]
Switching Characteristics Over the Operating Range[14]
Description
74FCT16245T
74FCT162245T 74FCT16245AT
74FCT162245AT
74FCT162H245AT Fig.
No.[15]
Parameter Min. Max. Min. Max. Unit
tPLH
tPHL Propagation Delay Data to Output
A to B, B to A 1.5 7.0 1.5 4.5 ns 1, 3
tPZH
tPZL Output Enable Time
OE to A or B 1.5 9.5 1.5 6.2 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time
OE to A or B 1.5 7.5 1.5 5.0 ns 1, 7, 8
tPZH
tPZL Output Enable Time
DIR to A or B 1.5 9.5 1.5 6.2 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time
DIR to A or B 1.5 7.5 1.5 5.0 ns 1, 7, 8
tSK(O) Output Skew[16] 0.5 0.5 ns —
Description
74FCT16245CT
74FCT162245CT
74FCT162H245CT
74FCT16245ET
74FCT162245ET
74FCT162H245ET Fig.
No.[15]
Parameter Min. Max. Min. Max. Unit
tPLH
tPHL Propagation Delay Data to Output
A to B, B to A 1.5 4.1 1.5 3.2 ns 1, 3
tPZH
tPZL Output Enable Time
OE to A or B 1.5 5.8 1.5 4.4 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time
OE to A or B 1.5 4.8 1.5 4.0 ns 1, 7, 8
tPZH
tPZL Output Enable Time
DIR to A or B 1.5 5.8 1.5 4.8 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time
DIR to A or B 1.5 4.8 1.5 4.0 ns 1, 7, 8
tSK(O) Output Skew[16] 0.5 0.5 ns —
Note:
14. Minimum limits are specified but not tested on Propagation Delays.
15. See “Parameter Measurement Information” in the General Information section.
16. Skew between any two outputs of the same package switching in the same direction. This parameter is ensured by design.
Ordering Information CY74FCT16245
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
3.2 CY74FCT16245ETPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16245ETPVC/PVCT O48 48-Lead (300-Mil) SSOP
4.1 CY74FCT16245CTPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16245CTPVC/PVCT O48 48-Lead (300-Mil) SSOP
4.5 CY74FCT16245ATPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16245ATPVC/PVCT O48 48-Lead (300-Mil) SSOP
7.0 CY74FCT16245TPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16245TPVC/PVCT O48 48-Lead (300-Mil) SSOP
CY74FCT16245
T
CY74FCT162245
T
CY74FCT162H245
T
6
Ordering Information CY74FCT162245
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
3.2 74FCT162245ETPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162245ETPVC O48 48-Lead (300-Mil) SSOP
74FCT162245ETPVCT O48 48-Lead (300-Mil) SSOP
4.1 CY74FCT162245CTPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162245CTPVC O48 48-Lead (300-Mil) SSOP
74FCT162245CTPVCT O48 48-Lead (300-Mil) SSOP
4.5 74FCT162245ATPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162245ATPVC O48 48-Lead (300-Mil) SSOP
74FCT162245ATPVCT O48 48-Lead (300-Mil) SSOP
7.0 CY74FCT162245TPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162245TPVC/PVCT O48 48-Lead (300-Mil) SSOP
Ordering Information CY74FCT162H245
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
3.2 74FCT162H245ETPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162H245ETPVC O48 48-Lead (300-Mil) SSOP
74FCT162H245ETPVCT O48 48-Lead (300-Mil) SSOP
4.1 74FCT162H245CTPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162H245CTPVC O48 48-Lead (300-Mil) SSOP
74FCT162H245CTPVCT O48 48-Lead (300-Mil) SSOP
4.5 74FCT162H245ATPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162H245ATPVC O48 48-Lead (300-Mil) SSOP
74FCT162H245ATPVCT O48 48-Lead (300-Mil) SSOP
CY74FCT16245T/2245T
CY74FCT16445T/2H245T
7
Package Diagrams
48-Lead Shrunk Small Outline Package O48
CY74FCT16245
T
CY74FCT162245
T
CY74FCT162H245
T
8
Package Diagrams
48-Lead Thin Shrunk Small Outline Package Z48
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Copyright 2000, Texas Instruments Incorporated
