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TC74HCT240,244AP/AF
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74HCT240AP,TC74HCT240AF TC74HCT244AP,TC74HCT244AF
Octal Bus Buffer with TTL Input Level TC74HCT240AP/AF Inverted, 3-State Outputs TC74HCT244AP/AF Non-Inverted, 3-State Outputs
The TC74HCT240A, and HCT244A are high speed CMOS OCTAL BUS BUFFERs fabricated with silicon gate C2MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. Their inputs are compatible with TTL, NMOS, and CMOS output voltage levels. The TC74HCT240A is an inverting 3-state buffer having two active-low output enables. The TC74HCT244A is non-inverting 3-state buffer the HCT244A has two active-low output enables. These devices are designed to be used with 3-state memory address drivers, etc. All inputs are equipped with protection circuits against static discharge or transient excess voltage.
TC74HCT240AP, TC74HCT244AP
TC74HCT240AF, TC74HCT244AF
Features
* * * * * * * * * * High speed: tpd = 13 ns (typ.) at VCC = 5 V Low power dissipation: ICC = 4 A (max) at Ta = 25C Compatible with TTL outputs: VIL = 0.8 V (max) VIH = 2.0 V (min) Wide interfacing ability: LSTTL, NMOS, CMOS Output drive capability: 15 LSTTL loads Symmetrical output impedance: |IOH| = IOL = 6 mA (min) Balanced propagation delays: tpLH - tpHL Wide operating voltage range: VCC (opr) = 2~6 V Pin and function compatible with 74LS240/244
Weight DIP20-P-300-2.54A SOP20-P-300-1.27A
: 1.30 g (typ.) : 0.22 g (typ.)
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TC74HCT240,244AP/AF
Pin Assignment
TC74HCT240A TC74HCT244A
IEC Logic Symbol
TC74HCT240A TC74HCT244A
Truth Table
Inputs Outputs Yn L H Z
G
L L H
An L H X
Y n
H L Z
: For TC74HCT240A only X: Don't care Z: High impedance
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Absolute Maximum Ratings (Note 1)
Characteristics Supply voltage range DC input voltage DC output voltage Input diode current Output diode current DC output current DC VCC/ground current Power dissipation Storage temperature Symbol VCC VIN VOUT IIK IOK IOUT ICC PD Tstg Rating -0.5~7 -0.5~VCC + 0.5 -0.5~VCC + 0.5 20 20 35 75 500 (DIP) (Note 2)/180 (SOP) -65~150 Unit V V V mA mA mA mA mW C
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: 500 mW in the range of Ta = -40~65C. From Ta = 65 to 85C a derating factor of -10 mW/C shall be applied until 300 mW.
Operating Ranges (Note)
Characteristics Supply voltage Input voltage Output voltage Operating temperature Input rise and fall time Symbol VCC VIN VOUT Topr tr, tf Rating 4.5~5.5 0~VCC 0~VCC -40~85 0~500 Unit V V V C ns
Note:
The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND.
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Electrical Characteristics
DC Characteristics
Test Condition Characteristics High-level input voltage Low-level input voltage High-level output voltage Low-level output voltage 3-state output off-state current Input leakage current Quiescent supply current Symbol VCC (V) IOH = -20 A VIN = VIH or IOH = -6 mA VIL IOL = 20 A VIN = VIH or IOL = 6 mA VIL VIN = VIH or VIL VOUT = VCC or GND VIN = VCC or GND VIN = VCC or GND Per input: VIN = 0.5 V or 2.4 V Other input: VCC or GND 4.5~ 5.5 4.5~ 5.5 4.5 4.5 4.5 4.5 5.5 5.5 5.5 5.5 Min 2.0 4.4 4.18 Ta = 25C Typ. 4.5 4.31 0.0 0.17 Max 0.8 0.1 0.26 0.5 0.1 4.0 2.0 Ta = -40~85C Min 2.0 4.4 4.13 Max 0.8 0.1 0.33 5.0 1.0 40.0 2.9 Unit
VIH VIL VOH
V V V
VOL
V
IOZ IIN ICC IC
A A A mA
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AC Characteristics (input: tr = tf = 6 ns)
Test Condition Characteristics Symbol tTLH tTHL CL (pF) 50 VCC (V) 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 Min (Note 2) CPD (Note 3) Ta = 25C Typ. 7 6 15 13 21 16 15 13 21 18 17 14 23 20 16 13 5 10 33 31 Max 12 11 22 20 30 27 25 22 33 29 30 27 38 34 30 27 10 Ta = -40~85C Min Max 15 14 28 25 38 34 31 28 41 37 38 34 48 43 38 34 10 pF ns pF pF ns ns ns Unit
Output transition time
ns
Propagation delay time (Note 2)
tpLH tpHL
50 150
Propagation delay time (Note 3)
tpLH tpHL
50 150
3-state output enable time
tpZL tpZH
50 RL = 1 k 150
3-state output disable time Input capacitance Output capacitance Power dissipation capacitance (Note 1)
tpLZ tpHZ CIN COUT
RL = 1 k
50
Note 1: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr) = CPDVCCfIN + ICC/8 (per bit) Note 2: TC74HCT240A Note 3: TC74HCT244A
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Package Dimensions
Weight: 1.30 g (typ.)
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Package Dimensions
Weight: 0.22 g (typ.)
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RESTRICTIONS ON PRODUCT USE
* The information contained herein is subject to change without notice.
20070701-EN GENERAL
* TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer's own risk. * The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties. * Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations.
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