16-Bit Transceiver. CY74FCT16445T Datasheet

CY74FCT16445T Transceiver. Datasheet pdf. Equivalent

CY74FCT16445T Datasheet
Recommendation CY74FCT16445T Datasheet
Part CY74FCT16445T
Description 16-Bit Transceiver
Feature CY74FCT16445T; 1CY 74FCT1 644 5T/2 H24 5T fax id: 7041 CY74FCT16245T/2245T CY74FCT16445T/2H245T Features • Low p.
Manufacture Cypress Semiconductor
Datasheet
Download CY74FCT16445T Datasheet




Cypress Semiconductor CY74FCT16445T
1CY 74FCT1 644 5T/2
H24 5T
fax id: 7041
CY74FCT16245T/2245T
CY74FCT16445T/2H245T
Features
Low power, pin-compatible replacement for ABT
functions
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
Extended commercial 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
CY74FCT16445T Features:
64 mA sink current, 32 mA source current
Reduces system loading
16-Bit Transceiver
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) trans-
fers data when LOW and isolates the buses when HIGH. The
output buffers are designed with power off disable capability 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 minimal
undershoot and reduced ground bounce. The
CY74FCT162245T is ideal for driving transmission lines.
The CY74FCT16445T is designed for 16-bit operation, reduc-
ing control lines from two OE and two DIR pins to one OE and
one DIR pin to reduce loading.
The CY74FCT162H245T is a 24-mA balanced output part that
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.
Logic Block Diagrams CY74FCT16245T,CY74FCT162245T,
CY74FCT162H245T
1DIR
1A1
1A2
1A3
1A4
1A5
1A6
1A7
1A8
1OE
1B1
1B2
1B3
1B4
1B5
1B6
1B7
1B8
FCT16245–1
2DIR
2A1
2A2
2A3
2A4
2A5
2A6
2A7
2A8
2OE
2B1
2B2
2B3
2B4
2B5
2B6
2B7
2B8
FCT16245–2
Pin Configuration
SSOP/TSSOP
Top View
1DIR
1B1
1B2
GND
1B3
1B4
VCC
1B5
1B6
GND
1B7
1B8
2B1
2B2
GND
2B3
2B4
VCC
2B5
2B6
GND
2B7
2B8
2DIR
1 48
2 47
3 46
4 45
5 44
6 43
7 16245T 42
8
162245T 41
162H2455T
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 32
18 31
19 30
20 29
21 28
22 27
23 26
24 25
1OE
1A1
1A2
GND
1A3
1A4
VCC
1A5
1A6
GND
1A7
1A8
2A1
2A2
GND
2A3
2A4
VCC
2A5
2A6
GND
2A7
2A8
2OE
FCT16245–3
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 1994 – Revised March 18, 1997



Cypress Semiconductor CY74FCT16445T
CY74FCT16245T/2245T
CY74FCT16445T/2H245
Logic Block DiagramCY74FCT16445T
DIR
OE
A1
B1
A2
B2
A3
B3
A4
B4
TO OTHER 12 CHANNELS
FCT16245–4
Pin Configuration
SSOP/TSSOP
Top View
DIR
B1
B2
GND
B3
B4
VCC
B5
B6
GND
B7
B8
B9
B10
GND
B11
B12
VCC
B13
B14
GND
B15
B16
NC
1 48
2 47
3 46
4 45
5 44
6 43
7 16445T 42
8 41
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 32
18 31
19 30
20 29
21 28
22 27
23 26
24 25
OE
A1
A2
GND
A3
A4
VCC
A5
A6
GND
A7
A8
A9
A10
GND
A11
A12
VCC
A13
A14
GND
A15
A16
NC
FCT16245–5
Pin Description
Name
OE
DIR
A
B
Description
Three-State Output Enable Inputs (Active LOW)
Direction Control
Inputs or Three-State Outputs[1]
Inputs or Three-State Outputs[1]
Function Table[2]
Inputs
OE
L
L
H
DIR
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
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)
Operating Range
Range
Ambient
Temperature
Commercial
–40°C to +85°C
VCC
5V ± 10%
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. Operation beyond the limits set forth may impair the useful life of the device. Unless otherwise noted, these limits are over the operating free-air temperature range.
4. Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground.
2



Cypress Semiconductor CY74FCT16445T
CY74FCT16245T/2245T
CY74FCT16445T/2H245
Electrical Characteristics Over the Operating Range
Parameter
Description
Test Conditions
VIH Input HIGH Voltage
VIL Input LOW Voltage
VH Input Hysteresis[6]
VIK Input Clamp Diode Voltage
IIH Input HIGH Current
Standard
Bus Hold
VCC=Min., IIN=–18 mA
VCC=Max., VI=VCC
IIL
IBBH
IBBL
IBHHO
IBHLO
IOZH
Input LOW Current
Standard VCC=Max., VI=GND
Bus Hold
Bus Hold Sustain Current on Bus Hold Input[7] VCC=Min.
VI=2.0V
VI=0.8V
Bus Hold Overdrive Current on Bus Hold Input[7] VCC=Max., VI=1.5V
High Impedance Output Current
(Three-State Output pins)
VCC=Max., VOUT=2.7V
IOZL High Impedance Output Current
(Three-State Output pins)
IOS Short Circuit Current[8]
IO Output Drive Current[8]
IOFF Power-Off Disable
VCC=Max., VOUT=0.5V
VCC=Max., VOUT=GND
VCC=Max., VOUT=2.5V
VCC=0V, VOUT4.5V[9]
Min.
2.0
–50
+50
Typ.[5] Max.
100
–0.7
0.8
–1.2
±1
±100
±1
±100
TBD
Unit
V
V
mV
V
µA
µA
µA
µA
mA
±1 µA
±1 µA
–80 –140 –200 mA
–50 –180 mA
±1 µA
Output Drive Characteristics for CY74FCT16245T, CY74FCT16445T
Parameter
Description
VOH Output HIGH Voltage
VOL Output LOW Voltage
Test Conditions
VCC=Min., IOH=–3 mA
VCC=Min., IOH=–15 mA
VCC=Min., IOH=–32 mA
VCC=Min., IOL=64 mA
Min.
2.5
2.4
2.0
Typ.[5]
3.5
3.5
3.0
0.2
Max.
0.55
Unit
V
V
V
V
Output Drive Characteristics for CY74FCT162245T, CY74FCT162H245T
Parameter
Description
Test Conditions
Min. Typ.[5] Max. Unit
IODL
IODH
Output LOW Current[8]
Output HIGH Current[8]
VCC=5V, VIN=VIH or VIL, VOUT=1.5V
VCC=5V, VIN=VIH or VIL, VOUT=1.5V
60 115 150 mA
–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 guaranteed 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.
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