IDT74FCT621ATDB [IDT]
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN); 快速CMOS八路总线收发器（开漏）
| 型号： | IDT74FCT621ATDB |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) |
| 文件： | 总6页 (文件大小：71K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IDT54/74FCT621T/AT
FAST CMOS
OCTAL BUS TRANSCEIVER
(OPEN DRAIN)
Integrated Device Technology, Inc.
DESCRIPTION:
FEATURES:
• Std. and A speed grades
The IDT54/74FCT621T/AT is an octal transceiver with
non-inverting Open-Drain bus compatible outputs in both
send and receive directions. The B bus outputs are capable
of sinking 64mA providing very good capacitive drive
characteristics. Theseoctalbustransceiversaredesignedfor
asynchronous two-way communication between data buses.
The control function implementation allows for maximum
flexibility in timing.
• Low input and output leakage ≤1µA (max.)
• CMOS power levels
• True TTL input and output compatibility
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)
• Power off disable outputs permit “live insertion”
• Meets or exceeds JEDEC standard 18 specifications
• Product available in Radiation Tolerant and Radiation
Enhanced versions
• Military product compliant to MIL-STD-883, Class B
and DESC listed (dual marked)
• Available in DIP, SOIC, CERPACK and LCC packages
FUNCTIONAL BLOCK DIAGRAM (1)
PIN CONFIGURATIONS
1
2
20
19
18
17
16
15
14
13
12
11
GAB
Vcc
GBA
A
A
1
GBA
GAB
3
2
B
B
B
B
B
B
B
B
1
2
3
4
5
6
7
8
P20-1,
D20-1,
SO20-2
&
4
A
A
A
A
A
A
3
5
4
6
5
6
7
8
E20-1
7
8
1
A
B1
9
10
GND
2538 drw 02
DIP/SOIC/CERPACK
TOP VIEW
INDEX
3
2
20 19
18
A
A
A
A
A
3
4
5
6
7
4
5
6
7
8
B
B
B
B
B
1
2
3
4
5
A
2
–A
8
B2–B8
1
17
16
15
14
L20-2
7 Other Transceivers
2538 drw 01
10 11 12 13
9
2538 drw 03
LCC
TOP VIEW
The IDT logo is a registered trademark of Integreted Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
APRIL 1994
1995 Integrated Device Technology, Inc.
6.18
DSC-4222/4
1
IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
FUNCTION TABLE(1)
Pin Names
GBA, GAB
A1 – A8
Description
Enable Inputs
BA
GAB
Function
B data to A bus
A data to B bus
OFF
G
Enable Inputs
L
L
H
L
A Inputs or Open-drain Outputs
B Inputs or Open-drain Outputs
H
H
L
B1 – B8
2538 tbl 01
H
B data to A bus
A data to B bus
NOTE:
2538 tbl 02
1. H = HIGH Voltage Level.
L = LOW Voltage Level.
OFF = HIGH if pull-up resistor is connected to Open-Drain output.
ABSOLUTE MAXIMUM RATINGS(1)
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Parameter(1)
Conditions Typ. Max. Unit
Symbol
Rating
Commercial
Military
Unit
Symbol
(2)
VTERM
Terminal Voltage
with Respect to
GND
–0.5 to +7.0 –0.5 to +7.0
V
CIN
Input
Capacitance
Output
VIN = 0V
6
8
10
pF
COUT
VOUT = 0V
12
pF
(3)
VTERM
Terminal Voltage
with Respect to
GND
–0.5 to
–0.5 to
V
Capacitance
VCC +0.5
VCC +0.5
2538 lnk 04
NOTE:
1. This parameter is measured at characterization but not tested.
TA
Operating
0 to +70
–55 to +125 °C
Temperature
Temperature
Under Bias
Storage
TBIAS
TSTG
–55 to +125 –65 to +135 °C
–55 to +125 –65 to +150 °C
Temperature
Power Dissipation
PT
0.5
0.5
W
IOUT
DC Output
Current
–60 to +120 –60 to +120 mA
2538 lnk 03
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress rating
onlyandfunctionaloperationofthedeviceattheseoranyotherconditions
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. No terminal voltage may exceed
VCC by +0.5V unless otherwise noted.
2. Input and VCC terminals only.
3. Outputs and I/O terminals only.
6.18
2
IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following conditions Apply Unless Otherwise Specified:
Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%
Symbol
VIH
VIL
Parameter
Test Conditions(1)
Min.
2.0
—
Typ.(2)
Max.
—
Unit
V
Input HIGH Level
Guaranteed Logic HIGH Level
—
Input LOW Level
Guaranteed Logic LOW Level
VCC = Max., VI = 2.7V
VCC = Max., VI = 0.5V
VCC = Max., VI = VCC (Max.)
VCC = Min., IN= –18mA
VCC = Max.
—
0.8
±1
V
IIH
Input HIGH Current(5)
Input LOW Current(5)
Input HIGH Current(5)
Clamp Diode Voltage
Output HIGH Current
—
—
µA
µA
µA
V
IIL
—
—
±1
II
—
—
±1
VIK
IOH
—
–0.7
—
–1.2
20
VOH = Vcc (Max.)
—
µA
VIN = VIH or VIL
VOL
VOL
IOFF
Output LOW Voltage
(B Bus)
VCC = Min.
IOL = 48mA MIL.(4)
IOL = 64mA COM’L.
IOL = 32mA MIL.(4)
IOL = 48mA COM’L.
—
—
—
0.3
0.3
—
0.55
0.5
±1
V
V
VIN = VIH or VIL
Output LOW Voltage
(A Bus)
VCC = Min.
VIN = VIH or VIL
Input/Output Power Off
Leakage(5)
VCC = 0V, VIN or VO ≤ 4.5V
µA
VH
Input Hysteresis
Quiescent Power Supply
Current
—
—
—
200
—
1
mV
mA
ICC
VCC = max., VIN = GND or Vcc
0.01
NOTES:
2538 tbl 05
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. These are maximum IOL values per output, for 8 outputs turned on simultaneously. Total maximum IOL (all outputs) is 512mA for commercial and
384mA for military. Derate IOL for number of outputs exceeding 8 turned on simultaneously.
4. The test limit for this parameter is ±5µA at TA = –55°C.
5. This parameter is guaranteed but not tested.
6.18
3
IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
∆ICC
Quiescent Power Supply Current
TTL Inputs HIGH
VCC = Max.
—
0.5
2.0
mA
VIN = 3.4V(3)
ICCD
Dynamic Power Supply Current(4)
Vcc = Max.
Outputs Open
VIN = VCC
VIN = GND
—
0.15
0.25
mA/MHz
GBA = GAB = GND or VCC
One Input Toggling
50% Duty Cycle
IC
Total Power Supply Current(6,7)
Vcc = Max.
Outputs Open
GBA = GAB = GND or VCC
One Bit Toggling
at fi =10MHz
VIN = VCC
VIN = GND
—
—
1.5
1.8
3.5
4.5
mA
VIN = 3.4V
VIN = GND
50% Duty Cycle
Vcc = Max.
Outputs Open
GBA = GAB = GND or VCC
Eight Bits Toggling
at fi = 2.5MHz
VIN = VCC
VIN = GND
—
—
3.0
5.0
6.0(5)
VIN = 3.4V
VIN = GND
14.0(5)
50% Duty Cycle
NOTES:
2538 tbl 06
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V); all other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fiNi)
ICC = Quiescent Current
∆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 Output Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fi = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
7. This test is performed with outputs tied to GND through a pull-down resistor.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
IDT54/74FCT621T
Com’l. Mil.
Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
IDT54/74FCT621AT
Com’l. Mil.
Symbol
tPLH
Parameter
Condition(1)
CL = 50pF
Propagation Delay A to B
5.5
1.5
5.5
1.5
5.5
1.5
5.5
1.5
13.0
8.5
5.5
1.5
5.5
1.5
5.5
1.5
5.5
1.5
13.5
9.5
5.5
1.5
5.5
1.5
5.5
1.5
5.5
1.5
12.0
6.8
5.5
1.5
5.5
1.5
5.5
1.5
5.5
1.5
12.5
7.6
ns
ns
ns
ns
tPHL
RL = 500Ω
tPLH
Propagation Delay B to A
Propagation Delay GBA to A
Propagation Delay GAB to B
12.5
8.0
13.0
9.0
12.0
6.4
12.5
7.2
tPHL
tPLH
14.0
8.5
14.5
9.5
13.0
6.8
13.5
7.6
tPHL
tPLH
14.0
8.0
14.5
9.0
13.0
6.4
13.5
7.2
tPHL
2538 tbl 07
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
6.18
4
IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
VCC
SWITCH POSITION
Test
Switch
7.0V
Open Drain
Disable Low
Closed
500Ω
Enable Low
VOUT
VIN
Open
Pulse
Generator
All Other Tests
D.U.T.
2538 lnk 08
DEFINITIONS:
CL= Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
50pF
500Ω
T
R
C
L
Generator.
2538 drw 03
SET-UP, HOLD AND RELEASE TIMES
PULSE WIDTH
3V
DATA
1.5V
0V
INPUT
LOW-HIGH-LOW
tH
t
SU
1.5V
PULSE
3V
1.5V
0V
TIMING
INPUT
t
W
ASYNCHRONOUS CONTROL
t
REM
PRESET
3V
1.5V
0V
CLEAR
HIGH-LOW-HIGH
PULSE
1.5V
ETC.
SYNCHRONOUS CONTROL
PRESET
3V
2538 drw 05
1.5V
0V
CLEAR
t
SU
t
H
CLOCK ENABLE
ETC.
2538 drw 04
PROPAGATION DELAY
ENABLE AND DISABLE TIMES
ENABLE
DISABLE
3V
1.5V
0V
3V
SAME PHASE
INPUT TRANSITION
CONTROL
INPUT
1.5V
0V
t
PLH
tPHL
tPZL
tPLZ
V
OH
OUTPUT
3.5V
1.5V
3.5V
1.5V
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
V
OL
tPLH
tPHL
0.3V
0.3V
V
OL
3V
1.5V
0V
t
PZH
tPHZ
OPPOSITE PHASE
INPUT TRANSITION
VOH
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
1.5V
0V
2538 drw 06
0V
2538 drw 07
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
HIGH
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns
6.18
5
IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT
Temperature Range
XX
FCT
X
X
X
X
Family DeviceType Package Process
Blank
B
Commercial
MIL-STD-883, Class B
P
Plastic DIP
D
CERDIP
SO
L
E
Small Outline IC
Leadless Chip Carrier
CERPACK
621T
Octal Bus Transceiver
High Drive
621AT
Blank
54
74
–55°C to +125°C
0°C to +70°C
2538 drw 08
6.18
6
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