– Packages include 25 mil pitch SSOP, 19.6 mil pitch
TSSOP, 15.7 mil pitch TVSOP and 25 mil pitch Cerpack
– Extended commercial range of -40°C to +85°C
• Features for FCT16501AT/CT/ET:
– High drive outputs (-32mA I
OH, 64mA IOL)
– Power off disable outputs permit “live insertion”
– Typical VOLP (Output Ground Bounce) < 1.0V at
VCC = 5V, TA = 25°C
• Features for FCT162501AT/CT/ET:
– Balanced Output Drivers: ±24mA (commercial),
±16mA (military)
– Reduced system switching noise
– Typical VOLP (Output Ground Bounce) < 0.6V at
VCC = 5V,TA = 25°C
• Features for FCT162H501AT/CT/ET:
– Bus Hold retains last active bus state during 3-state
– Eliminates the need for external pull up resistors
DESCRIPTION:
The FCT16501AT/CT/ET and FCT162501AT/CT/ET 18-
bit registered transceivers are built using advanced dual metal
FUNCTIONAL BLOCK DIAGRAM
OEAB
CLKBA
LEBA
CMOS technology. These high-speed, low-power 18-bit registered bus transceivers combine D-type latches and D-type
flip-flops to allow data flow in transparent, latched and clocked
modes. Data flow in each direction is controlled by outputenable (OEAB and
OEBA
), latch enable (LEAB and LEBA)
and clock (CLKAB and CLKBA) inputs. For A-to-B data flow,
the device operates in transparent mode when LEAB is HIGH.
When LEAB is LOW, the A data is latched if CLKAB is held at
a HIGH or LOW logic level. If LEAB is LOW, the A bus data
is stored in the latch/flip-flop on the LOW-to-HIGH transition of
CLKAB. OEAB is the output enable for the B port. Data flow
from the B port to the A port is similar but requires using
OEBA
LEBA and CLKBA. Flow-through organization of signal pins
simplifies layout. All inputs are designed with hysteresis for
improved noise margin.
The FCT16501AT/CT/ET are ideally suited for driving
high-capacitance loads and low-impedance backplanes. The
output buffers are designed with power off disable capability
to allow "live insertion" of boards when used as backplane
drivers.
The FCT162501AT/CT/ET have balanced output drive
with current limiting resistors. This offers low ground bounce,
minimal undershoot, and controlled output fall times–reducing
the need for external series terminating resistors. The
FCT162501AT/CT/ET are plug-in replacements for the
FCT16501AT/CT/ET and ABT16501 for on-board bus interface applications.
The FCT162H501AT/CT/ET have "Bus Hold" which retains the input's last state whenever the input goes to high
impedance. This prevents "floating" inputs and eliminates the
need for pull-up/down resistors.
,
OEBA
CLKAB
LEAB
C
D
C
D
2547 drw 01
1
B
A1
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
C
D
C
D
TO 17 OTHER CHANNELS
MILITARY AND COMMERCIAL TEMPERATURE RANGESAUGUST 1996
IDT54/74FCT16501AT/CT/ET, 162501AT/CT/ET, 162H501AT/CT/ET
FAST CMOS 18-BIT REGISTERED TRANSCEIVERMILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin NamesDescription
OEABA-to-B Output Enable Input
OEBA
LEABA-to-B Latch Enable Input
LEBAB-to-A Latch Enable Input
CLKABA-to-B Clock Input
CLKBAB-to-A Clock Input
AxA-to-B Data Inputs or B-to-A 3-State Outputs
BxB-to-A Data Inputs or A-to-B 3-State Outputs
NOTE:
1. On FCT16xH501T these pins have “Bus Hold”. All other pins are standard
inputs, outputs or I/Os.
ABSOLUTE MAXIMUM RATINGS
SymbolDescriptionMax.Unit
(2)
VTERM
(3)
VTERM
TSTGStorage Temperature–65 to +150°C
IOUTDC Output Current–60 to +120 mA
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is
not implied. Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
2. All device terminals except FCT162XXXT Output and I/O terminals.
3. Output and I/O terminals for FCT162XXXT.
B-to-A Output Enable Input (Active LOW)
Terminal Voltage with Respect to
GND
Terminal Voltage with Respect to
GND
(1)
(1)
2547 tbl 01
(1)
–0.5 to +7.0V
–0.5 to
CC +0.5
V
2547 lnk 03
V
FUNCTION TABLE
(1,4)
InputsOutputs
OEABLEABCLKABAxBx
LXX XZ
HHX LL
HHX HH
HL↑ LL
HL↑ HH
HLL XB
HLH XB
NOTES:2547 tbl 02
1. A-to-B data flow is shown. B-to-A data flow is similar but uses
LEBA, and CLKBA.
2. Output level before the indicated steady-state input conditions were
established.
3. Output level before the indicated steady-state input conditions were
established, provided that CLKAB was HIGH before LEAB went LOW.
4. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-impedance
↑ = LOW-to-HIGH Transition
(2)
(3)
OEBA
CAPACITANCE (TA = +25°C, f = 1.0MHz)
SymbolParameter
CINInput
Capacitance
CI/OI/O
Capacitance
NOTE:
1. This parameter is measured at characterization but not tested.
(1)
ConditionsTyp.Max. Unit
VIN = 0V3.56.0pF
VOUT = 0V3.58.0pF
2547 lnk 04
,
5.103
IDT54/74FCT16501AT/CT/ET, 162501AT/CT/ET, 162H501AT/CT/ET
FAST CMOS 18-BIT REGISTERED TRANSCEIVERMILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (STANDARD PARTS)
Following Conditions Apply Unless Otherwise Specified:
Commercial: TA = –40°C to +85°C, VCC = 5.0V ± 10%; Military: TA = –55°C to +125°C, VCC= 5.0V ± 10%
SymbolParameterTest Conditions
(1)
Min. Typ.
VIHInput HIGH LevelGuaranteed Logic HIGH Level2.0——V
VILInput LOW LevelGuaranteed Logic LOW Level——0.8V
II HInput HIGH Current (Input pins)