TC74LCX245F/FT/FK TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74LCX245F,TC74LCX245FT,TC74LCX245FK Low-Voltage Octal Bus Transceiver with 5-V Tolerant Inputs and Outputs The TC74LCX245 is a high-performance CMOS octal bus transceiver. Designed for use in 3.3-V systems, it achieves high-speed operation while maintaining the CMOS low power dissipation. The device is designed for low-voltage (3.3 V) VCC applications, but it could be used to interface to 5-V supply environment for both inputs and outputs. The direction of data transmission is determined by the level of the DIR input. The enable input ( OE ) can be used to disable the device so that the busses are effectively isolated. All inputs are equipped with protection circuits against static discharge. TC74LCX245F TC74LCX245FT Features (Note) • Low-voltage operation: VCC = 1.65 to 3.6 V • High-speed operation: tpd = 7.0 ns (max) (VCC = 3.0 to 3.6 V) • Ouput current: |IOH|/IOL = 24 mA (min) (VCC = 3.0 V) • Latch-up performance: ＞±500 mA • Available in JEITA SOP, TSSOP and VSSOP (US) • Bidirectional interface between 5.0 V and 3.3 V signals • Power-down protection provided on all inputs and outputs • Pin and function compatible with the 74 series TC74LCX245FK (74AC/VHC/HC/F/ALS/LS etc.) 245 type Note: Do not apply a signal to any bus pins when it is in the output mode. Damage may result. All floating (high impedance) bus pins must have their input levels fixed by means of pull-up or pull-down resistors. Weight SOP20-P-300-1.27A TSSOP20-P-0044-0.65A VSSOP20-P-0030-0.50 : 0.22g (typ.) : 0.08 g (typ.) : 0.03 g (typ.) Note: The Electrical Characteristics of VCC=1.8±0.15V is only applicable for products which manufactured from January 2009 onward. 1 2010-01-31 TC74LCX245F/FT/FK Pin Assignment (top view) IEC Logic Symbol OE DIR DIR 1 20 VCC A1 2 19 OE A2 3 18 B1 A3 4 17 B2 A4 5 16 B3 A2 A5 6 15 B4 A3 A6 7 14 B5 A7 8 13 B6 9 12 B7 GND 10 11 B8 G3 3EN1 (BA) 3EN2 (AB) A1 2 18 1 B1 2 A4 A5 A8 19 1 A6 A7 A8 3 17 4 16 5 15 6 14 7 13 B6 8 12 B7 9 11 B8 B2 B3 B4 B5 Truth Table Inputs OE DIR L L L H Outputs Function A-Bus B-Bus A=B Output Input H B=A Input Output X Z Z X: Don’t care Z: High impedance 2 2010-01-31 TC74LCX245F/FT/FK Absolute Maximum Ratings (Note 1) Characteristics Power supply voltage Symbol Rating Unit VCC −0.5 to 7.0 V VIN −0.5 to 7.0 V DC input voltage (DIR, OE ) −0.5 to 7.0 (Note 2) DC bus I/O voltage VI/O −0.5 to VCC + 0.5 V (Note 3) Input diode current IIK −50 Output diode current IOK ±50 DC output current IOUT ±50 mA Power dissipation PD 180 mW ICC/IGND ±100 mA Tstg −65 to 150 °C DC VCC/ground current Storage temperature mA (Note 4) mA Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction. Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook (“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). Note 2: Output in OFF state Note 3: High or low state. IOUT absolute maximum rating must be observed. Note 4: VOUT < GND, VOUT > VCC Operating Ranges (Note 1) Characteristics Power supply voltage Symbol VCC Input voltage Rating 1.65 to 3.6 1.5 to 3.6 (Note 2) 0 to 5.5 VIN (DIR, OE ) Bus I/O voltage VI/O Output current IOH/IOL Unit V 0 to 5.5 (Note 3) 0 to VCC (Note 4) ±24 (Note 5) ±12 (Note 6) Operating temperature Topr −40 to 85 Input rise and fall time dt/dv 0 to 10 V V mA °C (Note 7) ns/V Note 1: The operating ranges are required to ensure the normal operation of the device. Unused inputs and bus inputs must be tied to either VCC or GND. Please connect both bus inputs and the bus outputs with VCC or GND when the I/O of the bus terminal changes by the function. In this case, please note that the output is not short-circuited. Note 2: Data retention only Note 3: Output in OFF state Note 4: High or low state Note 5: VCC = 3.0 to 3.6 V Note 6: VCC = 2.7 to 3.0 V Note 7: VIN = 0.8 to 2.0 V, VCC = 3.0 V 3 2010-01-31 TC74LCX245F/FT/FK Electrical Characteristics DC Characteristics (Ta = −40 to 85°C) Characteristics H-level Symbol Test Condition Min Max 1.65 to 2.3 VCC×0.9 ⎯ 2.3 to 2.7 1.7 ⎯ 2.7 to 3.6 2.0 ⎯ 1.65 to 2.3 ⎯ VCC×0.1 2.3 to 2.7 ⎯ 0.7 2.7 to 3.6 ⎯ 0.8 1.65 to 3.6 VCC−0.2 ⎯ IOH = −4 mA 1.65 1.05 ⎯ IOH = −8 mA 2.3 1.7 ⎯ IOH = −12 mA 2.7 2.2 ⎯ IOH = −18 mA 3.0 2.4 ⎯ IOH = −24 mA 3.0 2.2 ⎯ IOL = 100 μA 1.65 to 3.6 ⎯ 0.2 IOL = 4 mA 1.65 ⎯ 0.45 IOL = 8 mA 2.3 ⎯ 0.7 IOL = 12 mA 2.7 ⎯ 0.4 IOL = 16 mA 3.0 ⎯ 0.4 IOL = 24 mA 3.0 ⎯ 0.55 1.65 to 3.6 ⎯ ±5.0 μA 1.65 to 3.6 ⎯ ±5.0 μA VIN/VOUT = 5.5 V 0 ⎯ 10.0 μA VIN = VCC or GND 1.65 to 3.6 ⎯ 10.0 VIN/VOUT = 3.6 to 5.5 V 1.65 to 3.6 ⎯ ±10.0 VIH = VCC − 0.6 V 2.7 to 3.6 ⎯ 500 ⎯ VIH Input voltage L-level ⎯ VIL IOH = −100 μA H-level VOH VIN = VIH or VIL Output voltage L-level VOL Input leakage current IIN 3-state output OFF state current IOZ Power-off leakage current IOFF Quiescent supply current ICC Increase in ICC per input ΔICC VIN = VIH or VIL VIN = 0 to 5.5 V VIN = VIH or VIL VOUT = 0 to 5.5 V 4 VCC (V) Unit V V μA 2010-01-31 TC74LCX245F/FT/FK AC Characteristics (Ta = −40 to 85°C) Characteristics Propagation delay time Output enable time Output disable time Output to output skew Note: Symbol tpLH tpHL tpZL tpZH tpLZ tpHZ Test Condition Figure 1, Figure 2 Figure 1, Figure 3 Figure 1, Figure 3 tosLH (Note) tosHL Min Max 1.8 ± 0.15 ⎯ 25.0 2.5 ± 0.2 ⎯ 9.0 2.7 ⎯ 8.0 3.3 ± 0.3 1.5 7.0 1.8 ± 0.15 ⎯ 34.0 2.5 ± 0.2 ⎯ 17.0 2.7 ⎯ 9.5 3.3 ± 0.3 1.5 8.5 1.8 ± 0.15 ⎯ 32.0 2.5 ± 0.2 ⎯ 16.0 2.7 ⎯ 8.5 3.3 ± 0.3 1.5 7.5 2.7 ⎯ ⎯ 3.3 ± 0.3 ⎯ 1.0 VCC (V) Unit ns ns ns ns Parameter guaranteed by design. (tosLH = |tpLHm − tpLHn|, tosHL = |tpHLm − tpHLn|) 5 2010-01-31 TC74LCX245F/FT/FK Dynamic Switching Characteristics (Ta = 25°C, input: tr = tf = 2.5 ns, CL = 50 pF, RL = 500 Ω) Characteristics Symbol Test Condition VCC (V) Typ. Unit Quiet output maximum dynamic VOL VOLP VIH = 3.3 V, VIL = 0 V 3.3 0.8 V Quiet output minimum dynamic VOL |VOLV| VIH = 3.3 V, VIL = 0 V 3.3 0.8 V Typ. Unit Capacitive Characteristics (Ta = 25°C) Characteristics Symbol Test Condition VCC (V) Input capacitance CIN DIR, OE 3.3 7 pF Bus input capacitance CI/O An, Bn 3.3 8 pF Power dissipation capacitance CPD fIN = 10 MHz 3.3 25 pF Note: (Note) CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption. Average operating current can be obtained by the equation: ICC (opr) = CPD･VCC･fIN + ICC/8 (per bit) 6 2010-01-31 TC74LCX245F/FT/FK AC Test Circuit RL Switch Parameter Switch tpLH, tpHL Open 6.0 V Measure tpLZ, tpZL RL CL Output Open 6.0 V or VCC×2 GND @VCC=3.3±0.3V @VCC=2.7V VCC×2 @VCC=2.5±0.2V @VCC=1.8±0.15V tpHZ, tpZH GND Figure 1 7 2010-01-31 TC74LCX245F/FT/FK AC Waveform tr tf 90% VIM Input (An, Bn) VIH 10% GND VOH Output (Bn, An) VOM tpLH VOL tpHL Figure 2 tpLH, tpHL tr tf 90% VIM Output Enable ( OE ) VIH 10% tpLZ GND tpZL VOH Output (An, Bn) Low to Off to Low VOM VX tpHZ VOH VY Output (An, Bn) High to Off to High VOL tpZH VOM GND Outputs enabled Outputs enabled Outputs disabled Figure 3 tpLZ, tpHZ, tpZL, tpZH VCC Symbol 3.3 ± 0.3 V 2.7V Input Output Load 2.5 ± 0.2 V 1.8 ± 0.15 V VIH 2.7V VCC VCC VIM 1.5V VCC/2 VCC/2 tr,tf 2.5ns 2.0ns 2.0ns VOM 1.5V VOH/2 VOH/2 VX VOL +0.3V VOL +0.15V VOL +0.15V VY VOH -0.3V VOL -0.15V VOL -0.15V CL 50pF 30pF 30pF RL 500Ω 500Ω 1kΩ 8 2010-01-31 TC74LCX245F/FT/FK Package Dimensions Weight: 0.22 g (typ.) 9 2010-01-31 TC74LCX245F/FT/FK Package Dimensions Weight: 0.08 g (typ.) 10 2010-01-31 TC74LCX245F/FT/FK Package Dimensions Weight: 0.03 g (typ.) 11 2010-01-31 TC74LCX245F/FT/FK RESTRICTIONS ON PRODUCT USE • Toshiba Corporation, and its subsidiaries and affiliates (collectively “TOSHIBA”), reserve the right to make changes to the information in this document, and related hardware, software and systems (collectively “Product”) without notice. • This document and any information herein may not be reproduced without prior written permission from TOSHIBA. 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