Document
20-BIT BUS SWITCH
IDT74FST163384 IDT74FST1632384 ADVANCE INFORMATION
Integrated Device Technology, Inc.
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 FST163384/1632384 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 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 FST163384 and FST1632384 are 20-bit TTL-compatible bus switches. The BEx pins provide enable control.
FUNCTIONAL BLOCK DIAGRAM
A0 B0 A10 B10
A4
B4
A14
B14
A5
B5
A15
B15
A9 BEA BEB
B9
A19 BEC BED
B19
3473 drw 01
PIN DESCRIPTION
Pin Names A0-19 B0-19 I/O I/O I/O I Description Bus A Bus B Bus Switch Enable (Active LOW)
3473 tbl 01
BEA, BEB, BEC, BED,
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
©1997 Integrated Device Technology, Inc.
FEBRUARY 1997
DSC-3473/4
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IDT74FST163384, IDT74FST1632384 20-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
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 –65 to +150 128 Unit V °C mA
BEA B0 A0 A1 B1 B2 A2 A3 B3 B4 A4 GND BEC B5 A5 A6 B6 B7 A7 A8 B8 B9 A9 GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 SO48-1 SO48-2 SO48-3
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
Vcc B19 A19 A18 B18 B17 A17 A16 B16 B15 A15 BEB Vcc A14 B14 A13 B13 B12 A12 A11 B11 B10 A10 BED
3473 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.
FUNCTION TABLE BEA BEB B0-4
H L H L H H L L Hi-Z A0-4 Hi-Z A0-4 B10-14 Hi-Z A10-14 Hi-Z A10-14
B5-9 Hi-Z Hi-Z A5-9 A5-9 B15-19 Hi-Z Hi-Z A15-19 A15-19
Description Disconnect Connect Connect Connect Description Disconnect Connect Connect Connect
3473 tbl 03
BEC
H L H L
BED
H H L L
CAPACITANCE(1)
Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. Unit 4
pF pF
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NOTES: 1. Capacitance is characterized but not tested 2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V
3473 drw 02
SSOP/ TSSOP/TVSOP TOP VIEW
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IDT74FST163384, IDT74FST1632384 20-BIT BUS 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%
Symbol VIH VIL II H II L IOZH IOZL IOS VIK RON Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Voltage High Impedance Output Current (3-State Output pins) Short Circuit Current Clamp Diode Voltage Switch On Resistance(4) VCC = Max., VO = GND(3) 163xxx 1632xxx 163xxx 1632xxx VCC = Min., IIN = –18mA VCC = Min. VIN = 0.0V ION = 30mA VCC = Min. VIN = 2.4V ION = 15mA IOFF ICC Input/Output Power Off Leakage Quiescent Power Supply Current VCC = 0V, VIN or VO ≤ 4.5V VCC = Max., VIN = GND or VCC VCC = Max. Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VI = VCC VI = GND VO = VCC VO = GND Min. 2.0 — — — — — — — — 20 — 20 — — Typ.(2) — — — — — — 300 –0.7 5 28 10 35 — 0.1 Max. — 0.8 ±1 ±1 ±1 ±1 — –1.2 7 40 15 48 1 3 µA µA
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Unit V V µA µA mA V Ω Ω
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 .