IDT IDT74FST1632383 20-bit bus exchange switch Datasheet

20-BIT BUS EXCHANGE
SWITCH
IDT74FST163383
IDT74FST1632383
ADVANCE INFORMATION
no noise of their own while providing a low resistance path for
an external driver. These devices connect input and output
ports through an n-channel FET. When the gate-to-source
junction of this FET is adequately forward-biased the device
conducts and the resistance between input and output ports
is small. Without adequate bias on the gate-to-source junction
of the FET, the FET is turned off, therefore with no VCC
applied, the device has hot insertion capability.
The low on-resistance and simplicity of the connection
between input and output ports reduces the delay in this path
to close to zero.
The FST1632xxx integrates terminating resistors in the
device, thus eliminating the need for external 25Ω series
resistors.
The FST163383 and FST1632383 each provide four 4-bit
TTL- compatible ports that support 2 way bus exchange. The
BX pin controls the bus exchange and the BE pin serves as the
enable pin.
FEATURES:
• Bus switches provide zero delay paths
• Extended commercial range of –40°C to +85°C
• Low switch on-resistance:
FST163xxx – 5Ω
FST1632xxx — 28Ω
• TTL-compatible input and output levels
• ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
• Available in SSOP, TSSOP and TVSOP
DESCRIPTION:
The FST163383/1632383 belong to IDT's family of Bus
switches. Bus switch devices perform the function of connecting or isolating two ports without providing any inherent
current sink or source capability. Thus they generate little or
FUNCTIONAL BLOCK DIAGRAM
A0
C0
A5
C5
B0
D0
B5
D5
A4
C4
A9
C9
B4
D4
B9
D9
BX1
BE1
BX2
BE2
3474 drw 01
PIN DESCRIPTION
Pin Names
A0-9, B0-9
I/O
I/O
Description
Buses A, B
C0-9, D0-9
I/O
Buses C, D
BE1,2
I
Bus Switch Enable (Active LOW)
BX1,2
I
Bus Exchange
3474 tbl 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
MAY 1996
1997 Integrated Device Technology, Inc.
DSC-3474/4
1
IDT74FST163383, IDT74FST1632383
20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
BE1
1
48
Vcc
C0
2
47
D4
A0
3
46
B4
B0
4
45
A4
D0
5
44
C4
C1
6
43
D3
A1
7
42
B3
B1
8
41
A3
D1
9
40
C3
C2
10
39
D2
A2
11
38
B2
GND
12
37
BX1
BE2
13
36
Vcc
C5
14
35
D9
A5
15
34
B9
B5
16
33
A9
D5
17
32
C9
C6
18
31
D8
A6
19
30
B8
SO48-1
SO48-2
SO48-3
Symbol
Description
VTERM(2) Terminal Voltage with Respect
to GND
TSTG
Storage Temperature
I OUT
Maximum Continuous Channel
Current
Max.
–0.5 to +7.0
Unit
V
–65 to +150
°C
128
mA
3474 tbl 02
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 condiitions for extended
periods may affect reliability.
2. VCC, Control and Switch terminals.
CAPACITANCE(1)
Symbol
Conditions(2) Typ. Unit
Parameter
CIN
Control Input Capacitance
CI/O
Switch Input/Output
Capacitance
4
Switch Off
pF
3474 tbl 03
NOTES:
1. Capacitance is characterized but not tested.
2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V
FUNCTION TABLE
BE1
BX1
A0-4
pF
H
X
Hi-Z
B0-4
Hi-Z
Description
Disconnect
L
L
C0-4
D0-4
Connect
L
H
D0-4
C0-4
Exchange
B6
20
29
A8
D6
21
28
C8
BE2
H
BX2
X
A5-9
Hi-Z
B5-9
Hi-Z
Description
Disconnect
C7
22
27
D7
L
L
C5-9
D5-9
Connect
A7
23
26
B7
L
H
D5-9
C5-9
Exchange
GND
24
25
BX2
3474 tbl 04
SSOP/
TSSOP/TVSOP
TOP VIEW
3474 drw 02
2
IDT74FST163383, IDT74FST1632383
20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: TA = –40°C to +85°C, VCC = 5.0V ±10%
Parameter
Input HIGH Voltage
Test Conditions(1)
Guaranteed Logic HIGH for Control Inputs
Min.
2.0
Typ.(2)
—
Max.
—
Unit
V
VIL
Input LOW Voltage
Guaranteed Logic LOW for Control Inputs
—
—
0.8
V
II H
Input HIGH Current
VCC = Max.
VI = VCC
—
—
±1
µA
II L
Input LOW Voltage
VI = GND
—
—
±1
IOZH
High Impedance Output Current
IOZL
(3-State Output pins)
IOS
Short Circuit Current
VIK
Clamp Diode Voltage
Symbol
VIH
RON
Switch On
Resistance(4)
VO = VCC
—
—
±1
VO = GND
—
—
±1
VCC = Max., VO = GND(3)
—
300
—
mA
VCC = Min., IIN = –18mA
—
–0.7
–1.2
V
Ω
VCC = Max.
VCC = Min. VIN = 0.0V
163xxx
—
5
7
ION = 30mA
1632xxx
17
28
40
VCC = Min. VIN = 2.4V
163xxx
—
10
15
ION = 15mA
1632xxx
20
35
48
µA
Ω
IOFF
Input/Output Power Off Leakage
VCC = 0V, VIN or VO ≤ 4.5V
—
—
1
µA
ICC
Quiescent Power Supply Current
VCC = Max., VIN = GND or VCC
—
0.1
3
µA
NOTES:
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. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. Measured by voltage drop between ports at indicated current through the switch.
3
3474 tbl 05
IDT74FST163383, IDT74FST1632383
20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
∆ICC
ICCD
IC
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
Current(4)
Total Power Supply Current (6)
Test Conditions(1)
VCC = Max.
VIN = 3.4V(3)
VCC = Max.
Outputs Open
Enable Pin Toggling
50% Duty Cycle
VCC = Max.
Outputs Open
Enable Pins Toggling
(20 Switches Toggling)
fi = 10MHz
50% Duty Cycle
Min.
—
Typ.(2)
0.5
Max.
1.5
Unit
mA
VIN = VCC
VIN = GND
—
30
40
µA/
MHz/
Switch
VIN = VCC
VIN = GND
—
6.0
8.0
mA
VIN = 3.4
VIN = GND
—
6.5
9.5
NOTES:
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 (fiN)
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 Input Transition Pair (HLH or LHL)
fi = Input Frequency
N = Number of Switches Toggling at fi
All currents are in milliamps and all frequencies are in megahertz.
3474 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: TA =–40°C to +85°C, VCC = 5.0V ±10%
163383
Symbol
tPLH
tPHL
tBX
tPZH
tPZL
tPHZ
tPLZ
|QCI|
|QCDI|
Description
Data Propagation Delay
Ai to Ci, Di Bi to Ci, Di(3,4)
Switch Multiplex Delay
BX to Ai, Bi, Ci, Di
Switch Turn on Delay
BE to Ai, Bi, Ci, Di
Switch Turn off Delay
BE to Ai, Bi (3)
Charge Injection, Typical(5,7)
Charge Injection,
1632383
Condition(1)
Min.(2)
CL = 50pF
RL = 500Ω
—
Typ.
—
0.25
1.25
Unit
ns
1.5
—
6.5
7.5
ns
1.5
—
6.5
7.5
ns
1.5
—
5.5
5.5
ns
—
1.5
—
—
pC
—
0.5
—
—
Typical(6,7)
Max.
3474 tbl 07
NOTES:
1. See test circuit and waveforms.
2. Minimum limits guaranteed but not tested.
3. This parameter is guaranteed by design but not tested.
4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant
for the switch alone is of the order of 2.5ns for 50pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals,
it adds very little propagation delay to the system. Propagation delay on the bus switch when used in a system is determined by the driving circuit on the
driving side of the switch and its interaction with the load on the driven side.
5. Measured at switch turn off, load = 50 pF in parallel with 10 MΩ scope probe, VIN = 0.0 volts.
6. Measured at switch turn off through bus multiplexer, (e.g.- A to C = >A to D), load = 50 pF in parallel with 10 MΩ scope probe, VIN at A = 0.0 volts. Charge
injection is reduced because the injection from the turn off of the A to C switch is compensated by the turn on of the B to C switch.
7. Characterized parameter. Not 100% tested.
4
IDT74FST163383, IDT74FST1632383
20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V CC
SWITCH POSITION
500Ω
Pulse
Generator
Switch
Open Drain
Disable Low
Closed
Enable Low
V OUT
VIN
Test
7.0V
Open
All Other Tests
D.U.T.
50pF
RT
3474 lnk 08
DEFINITIONS:
CL= Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
500Ω
CL
3474 lnk 03
PULSE WIDTH
SET-UP, HOLD AND RELEASE TIMES
DATA
INPUT
tH
tSU
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
tREM
tSU
3V
1.5V
0V
3V
1.5V
0V
LOW-HIGH-LOW
PULSE
1.5V
tW
3V
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
3V
1.5V
0V
tH
3474 lnk 05
3474 lnk 04
PROPAGATION DELAY
ENABLE AND DISABLE TIMES
ENABLE
SAME PHASE
INPUT TRANSITION
tPLH
tPHL
OUTPUT
tPLH
OPPOSITE PHASE
INPUT TRANSITION
tPHL
3V
1.5V
0V
DISABLE
3V
1.5V
CONTROL
INPUT
OUTPUT
NORMALLY
LOW
3V
1.5V
0V
SWITCH
CLOSED
3.5V
1.5V
tPZH
OUTPUT
NORMALLY
HIGH
3474 lnk 06
SWITCH
OPEN
0V
tPLZ
tPZL
VOH
1.5V
VOL
3.5V
0.3V
VOL
tPHZ
0.3V
VOH
1.5V
0V
0V
3474 lnk 07
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control DisableHIGH
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns
5
IDT74FST163383, IDT74FST1632383
20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
FST 16 XX
Temp. Range
Device Type
X
Package
PV
PA
PF
Shrink Small Outline Package (SO48-1)
Thin Shrink Small Outline Package (SO48-2)
Thin Very Small Outline Package (SO48-3)
163383
1632383
20-Bit Bus Exchange Switch
74
–40°C to +85°C
3474 drw 08
6
Similar pages