QS54/74FCT245T, 2245T Q QUALITY SEMICONDUCTOR, INC. High-Speed CMOS 8-Bit Tranceivers QS54/74FCT245T QS54/74FCT2245T FEATURES/BENEFITS DESCRIPTION • Pin and function compatible to the 74F245 74FCT245/645 and 74ABT245 • Industrial temperature –40°C to 85°C • CMOS power levels: <7.5mW static • Available in DIP, SOIC, QSOP, ZIP, HQSOP • Undershoot clamp diodes on all inputs • TTL-compatible input and output levels • Ground bounce controlled outputs • Reduced output swing of 0-3.5V • Military product compliant to MIL-STD-883, Class B The QSFCT245 and QSFCT2245 are 8-bit noninverting transceivers that have three-state outputs which are useful for bus-oriented applications. The Transmit/Receive (T/R) input determines the direction of data flow, either from A to B or B to A, and the Output Enable (OE) input enables the selected port for output. The FCT2245 is a 25Ω resistor output version useful for driving transmission lines and reducing system noise. The 2245 parts can replace the 245 series to reduce noise in an existing design. All inputs have clamp diode for undershoot noise suppression. All outputs have ground bounce suppression (see QSI Application Note AN-001), and outputs will not load an active bus when VCC is removed from the device. FCT-T 245T • JEDEC-FCT spec compatible • Std., A, C, and D speed grades; 3.8ns tPD for D • IOL = 64mA Ind., 48mA Mil. FCT-T 2245T • Built-in 25Ω series resistor outputs reduce reflection and other system noise • Std., A, and C speed grades; 4.1ns tPD for C • IOL = 12mA Ind. y n pa m o C n a w No Figure 1. Functional Block Diagram T/R OE 25Ω Ai 25Ω Bi FCT2245 Only MDSL-00012-04 DECEMBER 28, 1998 QUALITY SEMICONDUCTOR, INC. 1 QS54/74FCT245T, 2245T Figure 2. Pin Configurations (All Pins Top View) PDIP, SOIC, QSOP, HQSOP T/R A0 A1 A2 A3 A4 A5 A6 A7 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 ZIP T/R A1 A3 A5 A7 B7 B5 B3 B1 OE VCC OE B0 B1 B2 B3 B4 B5 B6 B7 1 3 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 A0 A2 A4 A6 GND B6 B4 B2 B0 VCC y n pa m o C Table 1. Pin Description Name I/O Description Ai I/O Data Bus A Bi I/O Data Bus B T/R I Direction OE I Output Enable n a w No Table 2. Function Table 2 OE T/R R A B H X Hi-Z Hi-Z Disable L L Output Input Bus B to Bus A L H Input Output Bus A to Bus B Function QUALITY SEMICONDUCTOR, INC. MDSL-00012-04 DECEMBER 28, 1998 QS54/74FCT245T, 2245T Table 3. Absolute Maximum Ratings Supply Voltage to Ground ................................................. –0.5V to 7.0V DC Output Voltage VOUT ................................................... –0.5V to 7.0V DC Input Voltage VIN ......................................................... –0.5V to 7.0V AC Input Voltage (for a pulse width ≤ 20ns) ................................. –3.0V DC Input Diode Current with VIN < 0 ........................................... –20mA DC Output Diode Current with VOUT < 0 ..................................... –50mA DC Output Current Max. Sink Current/Pin .................................. 120mA Maximum Power Dissipation .................................................... 0.5 watts TSTG Storage Temperature ............................................... –65° to 150°C Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to QSI devices that result in functional or reliability type failures. Table 4. Capacitance(1) TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V Pins(2) SOIC QSOP PDIP ZIP 1, 19 4 4 5 7 2-9, 11-18 8 8 9 10 Notes: 1. Capacitance is characterized but not tested. 2. Pin reference for 20-pin package. n a w Unit y n pa pF pF m o C Table 5. Power Supply Characteristics No Symbol Parameter Test Conditions(1) Quiescent Power Supply Current ∆ICC QCCD ICC Min Max Unit VCC = Max., freq = 0 0V ≤ VIN ≤ 0.2V or VCC-0.2V ≤ VIN ≤ VCC — 1.5 mA Supply Current per Input @ TTL HIGH VCC = Max., VIN = 3.4V, freq = 0(2) — 2.0 mA Supply Current per Input per MHz VCC = Max., Outputs Open and Enabled One Bit Toggling @ 50% Duty Cycle Other Inputs at GND or VCC(3,4) — 0.25 mA/ MHz Notes: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications. 2. Per TTL driven input (VIN = 3.4V). 3. For flip-flops, QCCD 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. This parameter is guaranteed by design but not tested. 4. IC can be computed using the above parameters as explained in the Technical Overview section. MDSL-00012-04 DECEMBER 28, 1998 QUALITY SEMICONDUCTOR, INC. 3 QS54/74FCT245T, 2245T Table 6. DC Electrical Characteristics Over Operating Range Industrial TA = –40°C to 85°C, VCC = 5.0V ±5% Symbol Military TA = –55°C to 125°C, VCC = 5.0V ±10% Parameter Test Conditions Min Typ(1) Max Unit VIH Input HIGH Voltage Logic HIGH for All Inputs 2.0 — — V VIL Input LOW Voltage Logic LOW for All Inputs — — 0.8 V ∆VT Input Hysteresis VTLH – VTHL for All Inputs — 0.2 — V | IIH | | IIL | Input Current Input HIGH or LOW VCC = Max., 0 ≤ VIN < VCC — — 5 µA | IOZ | Off-State Output Current (Hi-Z) VCC = Max., 0 ≤ VIN ≤ VCC — — 5 µA IOS Short Circuit Current (FCT245) VCC = Max., VOUT = GND(2,3) –60 — — mA IOR Current Drive (FCT2245 – 25Ω) VCC = Min., VOUT = 2.0V(3) 50 — — mA VIC Input Clamp Voltage VCC = Min., IIN = –18mA, TA = 25°C(3) — –0.7 VOH Output HIGH Voltage VCC = Min. IOH = –12mA (MIL) IOH = –15mA (IND) 2.4 2.4 — — y n a VOL Output LOW Voltage (FCT245) VCC = Min. IOL = 48mA (MIL) IOL = 64mA (IND) — — VOL Output LOW Voltage (FCT2245 – 25Ω) VCC = Min. IOL = 12mA (MIL) IOL = 12mA (IND) ROUT Output Resistance (FCT2245 – 25Ω) VCC = Min. IOL = 12mA (MIL) IOL = 12mA (IND) w o N an –1.2 V — — V — — 0.55 0.55 V — — — — 0.50 0.50 V — 20 25 28 — 40 Ω mp Co Notes: 1. Typical values indicate VCC = 5.0V and TA = 25°C. 2. Not more than one output should be shorted and the duration is ≤1 second. 3. These parameters are guaranteed by design but not tested. 4 QUALITY SEMICONDUCTOR, INC. MDSL-00012-04 DECEMBER 28, 1998 QS54/74FCT245T, 2245T Table 7. Switching Characteristics Over Operating Range Industrial TA = –40°C to 85°C, VCC = 5.0V ±5% CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted. Military TA = –55°C to 125°C, VCC = 5.0V ±10% 245 2245 Symbol Description(1) 245A 2245A 245C 2245C 245D Min Max Min Max Min Max Min Max Unit tPHL tPLH Propagation Delay Ai to/from Bi (245) IND MIL 1.5 1.5 7 7.5 1.5 1.5 4.6 4.9 1.5 1.5 4.1 4.5 1.5 — 3.8 — ns tPHL tPLH Propagation Delay Ai to/from Bi (2245) IND MIL 1.5 1.5 7 7.5 1.5 1.5 4.6 4.9 1.5 1.5 4.1 4.5 — — — — ns tPZH tPZL Output Enable Time OE, T/R to A/B (245) IND MIL 1.5 1.5 9.5 10 1.5 1.5 6.2 6.5 1.5 1.5 5.8 6.2 1.5 — 5.6 — ns tPZH tPZL Output Enable Time OE, T/R to A/B (2245) IND MIL 1.5 1.5 9.5 10 1.5 1.5 6.2 6.5 1.5 1.5 5.8 6.2 — — — — ns tPHZ tPLZ Output Disable Time OE, T/R to A/B IND(2) MIL(2) 1.5 1.5 7.5 10 1.5 1.5 5 6 1.5 1.5 4.5 5.2 Notes: 1. Minimums guaranteed but not tested. 2. This parameter is guaranteed by design but not tested. 3. See Test Circuit and Waveforms. y n pa 1.5 — 4.5 — ns m o C n a w No MDSL-00012-04 DECEMBER 28, 1998 QUALITY SEMICONDUCTOR, INC. 5