IDTQS74FCT2646CTQ [IDT]
Registered Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO24, QSOP-24;
| 型号： | IDTQS74FCT2646CTQ |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Registered Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO24, QSOP-24 光电二极管 |
| 文件： | 总6页 (文件大小：110K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HIGH-SPEED CMOS
8-BIT BUS INTERFACE
REGISTER TRANSCEIVER
IDTQS74FCT2646AT/CT
DESCRIPTION:
FEATURES:
TheIDTQS74FCT2646Tisan8-bithigh-speedCMOSTTL-compatible
registeredbus transceiverwith3-state outputs.These outputs alsohave
25Ω resistors, usefulfordrivingtransmissionlines andreducingsystem
noise. The 2646 series parts can replace the 646 series to reduce noise
in an existing design. All inputs have clamp diodes for undershoot noise
suppression. Alloutputs have groundbounce suppression. Outputs will
not load an active bus when Vcc is removed from the device.
−
−
−
−
−
−
CMOS power levels: <7.5mW static
Undershoot clamp diodes on all inputs
True TTL input and output compatibility
Ground bounce controlled outputs
Reduced output swing of 0 to 3.5V
Built-in 25Ω series resistor outputs reduce reflection and other
system noise
−
−
−
A and C speed grades with 5.4ns tPD for C
IOL = 12mA
Available in SOIC and QSOP packages
FUNCTIONALBLOCKDIAGRAM
A BUS
1
CAB
25Ω
REGISTER
21
G
3
DIR
2
SAB
MULTIPLEXER
22
21
3
MULTIPLEXER
REGISTER
SBA
CBA
G
DIR
23
25Ω
B BUS
INDUSTRIAL TEMPERATURE RANGE
JANUARY 2001
1
c
2001 Integrated Device Technology, Inc.
DSC-5390/2
IDTQS74FCT2646AT/CT
HIGH-SPEEDCMOS8-BITBUSINTERFACEREGISTERTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
ABSOLUTE MAXIMUM RATINGS (1)
PINCONFIGURATION
Symbol
Description
Max.
– 0.5 to +7
– 65 to +150
120
Unit
V
VTERM
TSTG
IOUT
IIK
Terminal Voltage with Respect to GND
Storage Temperature
24
23
22
21
20
19
18
17
16
15
14
13
1
VCC
CBA
SBA
G
CAB
SAB
DIR
A1
°C
2
3
4
DC Output Current Max Sink Current/Pin
Input Diode Current, VIN < 0
mA
mA
mA
– 20
IOK
Output Diode Current, VOUT < 0
– 50
FCTL
NOTE:
A2
B1
5
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.
SO24-2
SO24-8
B2
A3
6
B3
B4
A4
7
A5
8
A6
B5
B6
B7
B8
9
A7
10
11
12
O
CAPACITANCE
Symbol
(TA = +25 C, f = 1.0MHz)
Parameter(1)
Conditions
Typ.
Max. Unit
A8
CIN
Input Capacitance
VIN = 0V
8
—
—
pF
GND
COUT
Output Capacitance
VOUT = 0V
8
pF
FCT_1
SOIC/ QSOP
TOP VIEW
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
I/O
Description
Ax
I/O
A Bus
B Bus
Bx
CAB
CBA
SAB
SBA
DIR
G
I/O
I
I
I
I
I
I
Clock A to Register
Clock B to Register
A bus or Reg to B
B Bus or Reg to A
Direction, A to B or B to A
Output Enable
2
IDTQS74FCT2646AT/CT
HIGH-SPEEDCMOS8-BITBUSINTERFACEREGISTERTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
FUNCTION TABLE (1)
Inputs
Outputs
G
H
DIR
—
L
CAB
—
—
—
↑
CBA
—
—
—
—
↑
SAB
—
—
—
—
—
L
SBA
—
—
—
—
—
—
—
L
Ax
Z
Bx
Function
Z
Disabled
L
A
Z
Output A
L
H
Z
B
Output B
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Load A Register
Load B Register
A Bus to B Bus
AReg to BBus
B Bus to A Bus
BReg to ABus
—
—
—
—
—
—
—
—
—
H
—
—
H
NOTE:
1. H = HIGH
L = LOW
↑ = LOW-to-HIGH Transition
Z = High-Impedance
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Symbol
Parameter
Input HIGH Level
Test Conditions
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
TLH - VTHL for all inputs
CC = Max.
Min. Typ.(1) Max.
Unit
V
IH
2
—
—
0.2
—
—
0.8
—
V
V
IL
Input LOW Level
—
—
—
V
V
∆V
Input Hysteresis
V
T
I
IH
Input HIGH Current
Input LOW Current
Off-State Output Current (Hi-Z)
Current Drive
V
0 ≤ V < Vcc
±5
µA
IN
I
IL
IOZ
IOR
VCC = Max.
0 ≤ V ≤ Vcc
—
50
—
—
—
±5
—
µA
mA
V
IN
(2)
V
CC = Max., VOUT = 2.0V
(2)
V
IC
Input Clamp Voltage
Output HIGH Voltage
Output LOW Voltage
Output Resistance
–0.7
–1.2
V
CC = Min., I = –18mA, TA = 25 C
IN
°
V
OH
V
CC = Min.
CC = Min.
CC = Min.
IOH = -15mA
2.4
—
20
—
—
28
—
0.5
40
V
V
OL
V
IOL = 12mA
IOL = 12mA
V
ROUT
V
Ω
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. These parameters are guaranteed by design but not tested.
3
IDTQS74FCT2646AT/CT
HIGH-SPEEDCMOS8-BITBUSINTERFACEREGISTERTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
POWER SUPPLY CHARACTERISTICS
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Symbol
Parameter
Test Conditions(1)
Min.
Max.
Unit
ICC
Quiescent Power Supply Current
VCC = Max.
freq = 0
—
1.5
mA
0V ≤ VIN ≤ 0.2V or
Vcc-0.2V ≤ VIN ≤ Vcc
VCC = Max.
VIN = 3.4V
freq = 0
∆ICC
Supply Current per Input TTL Inputs HIGH
Supply Current per Input per MHz
—
—
2
mA
(2)
ICCD
VCC = Max.
0.25
mA/MHz
Outputs Open and Enabled
One Bit Toggling
50% Duty Cycle
Other inputs at GND or Vcc(3,4)
FCTL
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TLL driven input (VIN = 3.4V).
3. For flip-flops, ICCD is measured by switching one of the data input pins so that the output changes every clock cycle. This is a measurement of
device power consumption only and does not include power to drive load capacitance or tester capacitance.
4. 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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1)
74FCT2646AT
74FCT2646CT
Min.
Max.
Min.
Max.
Symbol
tPHLB
tPLHB
tPZH
Parameter
Bus to Bus Delay
Unit
2
6.3
1.5
5.4
ns
Output Enable Time
Output Disable Time
Clock to Bus Delay
SBA/SAB to Bus Delay
2
2
2
2
9.8
6.3
6.3
7.7
1.5
1.5
1.5
1.5
7.8
6.3
5.7
6.2
ns
ns
ns
ns
tPZL
tPHZ
tPLZ
tPHLC
tPLHC
tPHLS
tPLHS
tSU
Data Setup Time
2
1.5
5
—
—
—
2
1.5
5
—
—
—
ns
ns
ns
tH
tW
Data Hold Time
Clock Pulse Width HIGH or LOW
NOTE:
LOAD
1. C
LOAD
= 50pF, R = 500Ω unless otherwise noted.
4
IDTQS74FCT2646AT/CT
HIGH-SPEEDCMOS8-BITBUSINTERFACEREGISTERTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
TESTCIRCUITSANDWAVEFORMS
SWITCH POSITION
TEST CIRCUITS FOR ALL OUTPUTS
Test
Switch
Closed
Open
VCC
7.0V
Open Drain
Disable Low
Enable Low
All Other Tests
500Ω
500Ω
VOUT
VIN
Pulse
D.U.T.
Generator
FCTL
50pF
CL
DEFINITIONS:
L
RT
C = Load capacitance: includes jig and probe capacitance.
R = Termination resistance: should be equal to Z
T
OUT
of the Pulse
Generator.
FCTL link
PULSEWIDTH
SET-UP, HOLD, AND RELEASE TIMES
3V
1.5V
0V
DATA
INPUT
LOW-HIGH-LOW
PULSE
tH
tSU
1.5V
3V
1.5V
0V
TIMING
INPUT
tW
ASYNCHRONOUS CONTROL
tREM
PRESET
3V
CLEAR
ETC.
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
SYNCHRONOUS CONTROL
PRESET
3V
1.5V
0V
FCTL link
CLEAR
CLOCK ENABLE
ETC.
tSU
tH
FCTL link
PROPAGATIONDELAY
ENABLEANDDISABLETIMES
ENABLE
DISABLE
3V
3V
SAME PHASE
INPUT TRANSITION
1.5V
0V
CONTROL
INPUT
1.5V
0V
tPLH
tPHL
tPHL
tPZL
tPLZ
VOH
OUTPUT
3.5V
1.5V
3.5V
VOL
1.5V
VOL
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
tPLH
0.3V
0.3V
3V
tPZH
tPHZ
OPPOSITE PHASE
INPUT TRANSITION
1.5V
0V
VOH
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
1.5V
0V
FCTL link
0V
FCTL link
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
5
IDTQS74FCT2646AT/CT
HIGH-SPEEDCMOS8-BITBUSINTERFACEREGISTERTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
ORDERINGINFORMATION
IDTQS
XX
FCT
XXXX
XX
Device Type Package
Temp. Range
Small Outline IC (gull wing) (SO24-2)
Quarter Size Small Outline Package (SO24-8)
SO
Q
2646AT
2646CT
High-Speed CMOS 8-Bit Bus Interface Register Transceiver
–40°C to +85°C
74
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The IDT logo is a registered trademark of Integrated Device Technology, Inc.
6
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