Document
FAST CMOS 16-BIT BUFFER/LINE DRIVER
Integrated Device Technology, Inc.
IDT54/74FCT16244T/AT/CT/ET IDT54/74FCT162244T/AT/CT/ET IDT54/74FCT166244T/AT/CT IDT54/74FCT162H244T/AT/CT/ET
FEATURES:
• Common features: – 0.5 MICRON CMOS Technology – High-speed, low-power CMOS replacement for ABT functions – Typical tSK(o) (Output Skew) < 250ps – Low input and output leakage ≤ 1µ A (max.) – ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) – 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 FCT16244T/AT/CT/ET: – High drive outputs (-32mA IOH, 64mA IOL) – Power off disable outputs permit “live insertion” – Typical VOLP (Output Ground Bounce) < 1.0V at VCC = 5V, TA = 25°C • Features for FCT162244T/AT/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 FCT166244T/AT/CT: – Light Drive Balanced Output: ±8mA (commercial), ±6mA (military) – Minimal system switching noise – Typical VOLP (Output Ground Bounce) < 0.25V at VCC = 5V,TA = 25°C • Features for FCT162H244T/AT/CT/ET: – Bus-Hold retains last active bus state during 3-state – Eliminates the need for external pull up resistors
DESCRIPTION:
The 16-Bit Buffer/Line Driver is for bus interface or signal buffering applications requiring high speed and low power dissipation. These devices have a flow through pin organization, and shrink packaging to simplify board layout. All inputs are designed with hysteresis for improved noise margin. The three-state controls allow independent 4-bit, 8-bit or combined 16-bit operation. These parts are plug in replacements for 54/74ABT16244 where higher speed, lower noise or lower power dissipation levels are desired. The FCT16244T/AT/CT/ET are ideally suited for driving high capacitance loads (>200pF) and low impedance backplanes. These "high drive" buffers are designed with power off disable capability to allow "live insertion" of boards when used in a backplane interface. The FCT162244T/AT/CT/ET have balanced output current levels and current limiting resistors. These offer low ground bounce, minimal undershoot, and controlled output fall times, reducing the need for external series terminating resistors while still providing very high speed operation for loads of less than 200pF. The FCT166244T/AT/CT are suited for very low noise, point-to-point driving where there is a single receiver, or a very light lumped load (<100pF). The buffers are designed to limit the output current to levels which will avoid noise and ringing on the signal lines without using external series terminating resistors. The FCT162H244T/AT/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.
FUNCTIONAL BLOCK DIAGRAM
1OE 1A1 1A2 1A3 1A4 1Y1 1Y2 1Y3 1Y4
3OE 3 A1 3 A2 3Y1 3Y2
3 A3 3 A4 4OE
3Y3 3Y4
2OE 2A1 2A2 2A3 2A4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2Y1 2Y2 2Y3 2Y4
2544 drw 01
4 A1 4 A2 4 A3 4 A4
4Y1 4Y2 4Y3 4Y4
2544 drw 02
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996 Integrated Device Technology, Inc.
OCTOBER 1996
DSC-2544/9
5.2
15
IDT54/74FCT16244T/AT/CT/ET, 162244T/AT/CT/ET, 166244T/AT/CT, 162H244T/AT/CT/ET FAST CMOS 16-BIT BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
1OE 1Y1 1Y2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 SO48-1 37 SO48-2 SO48-3 36 35 34 33 32 31 30 29 28 27 26 25
2OE 1A1 1A2
1OE 1Y1 1Y2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 E48-1
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
2544 drw 04
2OE 1A1 1A2
GND
1Y3 1Y4
GND
1A3 1A4
GND
1Y3 1Y4
GND
1A3 1A4
VCC
2Y1 2Y2
VCC
2A1 2A2
VCC
2Y1 2Y2
VCC
2A1 2A2
GND
2Y3 2Y4 3Y1 3Y2
GND
2A3 2A4 3A1 3A2
GND
2Y3 2Y4 3Y1 3Y2
GND
2A3 2A4 3A1 3A2
GND
3Y3 3Y4
GND
3A3 3A4
GND
3Y3 3Y4
GND
3A3 3A4
VCC
4Y1 4Y2
VCC
4A1 4A2
VCC
4Y1 4Y2
VCC
4A1 4A2
GND
4Y3 4Y4 4OE
GND
4A3 4A4 3OE
GND
4Y3 4Y4 4OE
2544 drw 03
GND
4A3 4A4 3OE
SSOP/ TSSOP/TVSOP TOP VIEW
CERPACK TOP VIEW
PIN DESCRIPTION
Pin Names xOE xAx xYx Description 3–State Output Enable Inputs (Active LOW) Data Inputs(1) 3-State Outputs
2544 tbl 01 NOTE: 1. On FCT16xH these pins have “Bus-hold”. All other pins are standard inputs, outputs or I/Os.
5.2
2
IDT54/74FCT16244T/AT/CT/ET, 162244T/AT/CT/ET, 166244T/AT/CT, 162H244T/AT/CT/ET FAST CMOS 16-BIT BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max. VTERM(2) Terminal Voltage with Respect to –0.5 to +7.0 GND (3) Terminal Voltage with Respect to VTERM –0.5 to GND VCC +0.5 TSTG Storage Temperature –65 to +150 I OUT DC Out.