TC74HC123AP/AF/AFN TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC123AP,TC74HC123AF,TC74HC123AFN Dual Retriggerable Monostable Multivibrator The TC74HC123A is a high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, A input (negative edge), and B input (positive edge). These inputs are valid for a slow rise/fall time signal (tr = tf = 1 s) as they are schmitt trigger inputs. This device may also be triggered by using CLR input (positive edge). After triggering, the output stays in a MONOSTABLE state for a time period determined by the external resistor and capacitor (Rx, Cx ). A low level at the CLR input breaks this state. In the MONOSTABLE state, if a new trigger is applied, it extends the MONOSTABLE period (retrigger mode). Limits for Cx and Rx are: External capacitor, Cx: No limit External resistor, Rx: VCC = 2.0 V more than 5 kΩ VCC ≥ 3.0 V more than 1 kΩ All inputs are equipped with protection circuits against static discharge or transient excess voltage. Note: xxxFN (JEDEC SOP) is not available in Japan. TC74HC123AP TC74HC123AF TC74HC123AFN Features (Note) • High speed: tpd = 25 ns (typ.) at VCC = 5 V • Low power dissipation Standby state: ICC = 4 μA (max) at Ta = 25°C Active state: ICC = 700 μA (max) at Ta = 25°C • High noise immunity: VNIH = VNIL = 28% VCC (min) • Output drive capability: 10 LSTTL loads • • Symmetrical output impedance: |IOH| = IOL = 4 mA (min) ∼ tpHL Balanced propagation delays: tpLH − • Wide operating voltage range: VCC (opr) = 2 to 6 V • Pin and function compatible with 74LS123 Note: Weight DIP16-P-300-2.54A SOP16-P-300-1.27A SOL16-P-150-1.27 : 1.00 g (typ.) : 0.18 g (typ.) : 0.13 g (typ.) In the case of using only one circuit, CLR should be tied to GND, Rx/Cx･Cx･Q･ Q should be tied to OPEN, the other inputs should be tied to VCC or GND. 1 2007-10-01 TC74HC123AP/AF/AFN Pin Assignment IEC Logic Symbol 2 2007-10-01 TC74HC123AP/AF/AFN Block Diagram (Note 1)(Note 2) Note 1: Cx, Rx, Dx are external capacitor, resistor, and diode, respectively. Note 2: External clamping diode, Dx; The external capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied. If the supply voltage is turned off, Cx is discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large and VCC drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the capacitance of the supply voltage filter is large enough and VCC drops slowly, the in rush current is automatically limited and damage to the IC is avoided. The maximum value of forward current through the parasitic diode is ±20 mA. In the case of a large Cx, the limit of fall time of the supply voltage is determined as follows: tf ≥ (VCC − 0.7) Cx/20 mA (tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC.) In the event a system does not satisfy the above condition, an external clamping diode (Dx) is needed to protect the IC from in rush current. Truth Table Inputs Outputs CLR H H X L H L H Inhibit H X H L H Inhibit L Q Function B A Q Output Enable H L H X X Output Enable Output Enable L L H Inhibit X: Don’t care 3 2007-10-01 TC74HC123AP/AF/AFN System Diagram VCC QP RX/CX CX Vref L C2 C1 Vref H QN VCC D R Q CK Q F/F A B Q Q CLR Timing Chart 4 2007-10-01 TC74HC123AP/AF/AFN Functional Description (1) (2) (3) (4) Stand-by state The external capacitor (Cx) is fully charged to VCC in the stand-by state. That means, before triggering, the QP and QN transistors which are connected to the Rx/Cx node are in the off state. Two comparators that relate to the timing of the output pulse, and two reference voltage supplies turn off. The total supply current is only leakage current. Trigger operation Trigger operation is effective in any of the following three cases. First, the condition where the A input is low, and the B input has a rising signal; second, where the B input is high, and the A input has a falling signal; and third, where the A input is low and the B input is high, and the CLR input has a rising signal. After a trigger becomes effective, comparators C1 and C2 start operating, and QN is turned on. The external capacitor discharges through QN. The voltage level at the Rx/Cx node drops. If the Rx/Cx voltage level falls to the internal reference voltage Vref L, the output of C1 becomes low. The flip-flop is then reset and QN turns off. At that moment C1 stops but C2 continues operating. After QN turns off, the voltage at the Rx/Cx node starts rising at a rate determined by the time constant of external capacitor Cx and resistor Rx. Upon triggering, output Q becomes high, following some delay time of the internal F/F and gates. It stays high even if the voltage of Rx/Cx changes from falling to rising. When Rx/Cx reaches the internal reference voltage Vref H, the output of C2 becomes low, the output Q goes low and C2 stops its operation. That means, after triggering, when the voltage level of the Rx/Cx node reaches Vref H, the IC returns to its MONOSTABLE state. With large values of Cx and Rx, and ignoring the discharge time of the capacitor and internal delays of the IC, the width of the output pulse, tw (OUT), is as follows: tw (OUT) = 1.0 Cx Rx Retrigger operation When a new trigger is applied to either input A or B while in the MONOSTABLE state, it is effective only if the IC is charging Cx. The voltage level of the Rx/Cx node then falls to Vref L level again. Therefore the Q output stays high if the next trigger comes in before the time period set by Cx and Rx. If the new trigger is very close to previous trigger, such as an occurrence during the discharge cycle, it will have no effect. The minimum time for a trigger to be effective 2nd trigger, trr (Min.), depends on VCC and Cx. Reset operation In normal operation, the CLR input is held high. If CLR is low, a trigger has no effect because the Q output is held low and the trigger control F/F is reset. Also, QP turns on and Cx is charged rapidly to VCC. This means if CLR is set low, the IC goes into a wait state. 5 2007-10-01 TC74HC123AP/AF/AFN Absolute Maximum Ratings (Note 1) Characteristics Symbol Rating Unit Supply voltage range VCC −0.5 to 7 V DC input voltage VIN −0.5 to VCC + 0.5 V VOUT −0.5 to VCC + 0.5 V Input diode current IIK ±20 mA Output diode current IOK ±20 mA DC output current IOUT ±25 mA DC VCC/ground current ICC ±50 mA Power dissipation PD 500 (DIP) (Note 2)/180 (SOP) mW Storage temperature Tstg −65 to 150 °C DC output voltage 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 to 65°C. From Ta = 65 to 85°C a derating factor of −10 mW/°C shall be applied until 300 mW. Operating Ranges (Note 1) Characteristics Symbol Rating Unit Supply voltage VCC 2 to 6 V Input voltage VIN 0 to VCC V VOUT 0 to VCC V Topr −40 to 85 °C Output voltage Operating temperature Input rise and fall time ( CLR only) 0 to 1000 (VCC = 2.0 V) tr, tf 0 to 500 (VCC = 4.5 V) ns 0 to 400 (VCC = 6.0 V) External capacitor Cx External resistor Rx No limitation (Note 2) ≥5 k (VCC = 2.0 V) (Note 2) ≥1 k (VCC ≥ 3.0 V) (Note 2) F Ω Note 1: The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND. Note 2: The maximum allowable values of Cx and Rx are a function of leakage of capacitor Cx, the leakage of TC74HC123A, and leakage due to board layout and surface resistance. Susceptibility to externally induced noise signals may occur for Rx > 1 MΩ. 6 2007-10-01 TC74HC123AP/AF/AFN Electrical Characteristics DC Characteristics Characteristics High-level input voltage Low-level input voltage High-level output voltage VOH Low-level output voltage Min Typ. Max Min Max 2.0 1.50 ⎯ ⎯ 1.50 ⎯ 4.5 3.15 ⎯ ⎯ 3.15 ⎯ 6.0 4.20 ⎯ ⎯ 4.20 ⎯ 2.0 ⎯ ⎯ 0.50 ⎯ 0.50 4.5 ⎯ ⎯ 1.35 ⎯ 1.35 6.0 ⎯ ⎯ 1.80 ⎯ 1.80 2.0 1.9 2.0 ⎯ 1.9 ⎯ IOH = −20 μA 4.5 4.4 4.5 ⎯ 4.4 ⎯ 6.0 5.9 6.0 ⎯ 5.9 ⎯ IOH = −4 mA 4.5 4.18 4.31 ⎯ 4.13 ⎯ IOH = −5.2 mA 6.0 5.68 5.80 ⎯ 5.63 ⎯ 2.0 ⎯ 0.0 0.1 ⎯ 0.1 4.5 ⎯ 0.0 0.1 ⎯ 0.1 6.0 ⎯ 0.0 0.1 ⎯ 0.1 IOL = 4 mA 4.5 ⎯ 0.17 0.26 ⎯ 0.33 IOL = 5.2 mA 6.0 ⎯ 0.18 0.26 ⎯ 0.33 ⎯ VIL VIN = VIH or VIL IOL = 20 μA VOL (Q, Q ) Ta = −40 to 85°C VCC (V) ⎯ VIH (Q, Q ) Ta = 25°C Test Condition Symbol VIN = VIH or VIL Unit V V V V Input leakage current IIN VIN = VCC or GND 6.0 ⎯ ⎯ ±0.1 ⎯ ±1.0 μA Rx/Cx terminal off-state current IIN VIN = VCC or GND 6.0 ⎯ ⎯ ±0.1 ⎯ ±1.0 μA Quiescent supply current ICC VIN = VCC or GND 6.0 ⎯ ⎯ 4.0 ⎯ 40.0 μA 2.0 ⎯ 45 200 ⎯ 260 μA 4.5 ⎯ 400 500 ⎯ 650 μA 6.0 ⎯ 0.7 1.0 ⎯ 1.3 mA Active-state supply current (Note) Note: ICC VIN = VCC or GND Rx/Cx = 0.5 VCC Per circuit 7 2007-10-01 TC74HC123AP/AF/AFN Timing Requirements (input: tr = tf = 6 ns) Characteristics Minimum pulse width Minimum clear width Symbol tW (L) ⎯ tW (H) ⎯ tW (L) Rx = 1 kΩ Cx = 100 pF Minimum retrigger time Ta = 25°C Test Condition Ta = −40 to 85°C VCC (V) Typ. Limit Limit 2.0 ⎯ 75 95 4.5 ⎯ 15 19 6.0 ⎯ 13 16 2.0 ⎯ 75 95 4.5 ⎯ 15 19 6.0 ⎯ 13 16 2.0 325 ⎯ ⎯ 4.5 108 ⎯ ⎯ Unit ns ns ns 6.0 78 ⎯ ⎯ 2.0 5.0 ⎯ ⎯ 4.5 1.4 ⎯ ⎯ 6.0 1.2 ⎯ ⎯ Test Condition Min Typ. Max Unit ⎯ ⎯ 4 8 ns ⎯ ⎯ 25 36 ns ⎯ ⎯ 26 41 ns ⎯ ⎯ 16 27 ns trr Rx = 1 kΩ Cx = 0.01 μF μs AC Characteristics (CL = 15 pF, VCC = 5 V, Ta = 25°C, input: tr = tf = 6 ns) Characteristics Output transition time Symbol tTLH tTHL Propagation delay time tpLH ( A , B-Q, Q ) tpHL Propagation delay time tpLH ( CLR TRIGGER-Q, Q ) tpHL Propagation delay time tpLH ( CLR -Q, Q ) tpHL 8 2007-10-01 TC74HC123AP/AF/AFN AC Characteristics (CL = 50 pF, input: tr = tf = 6 ns) Ta = 25°C Test Condition Characteristics Output transition time Symbol ( A , B-Q, Q ) tpHL Propagation delay time tpLH Max Min Max 2.0 ⎯ 30 75 ⎯ 95 4.5 ⎯ 8 15 ⎯ 19 6.0 ⎯ 7 13 ⎯ 16 2.0 ⎯ 102 210 ⎯ 265 4.5 ⎯ 29 42 ⎯ 53 6.0 ⎯ 22 36 ⎯ 45 2.0 ⎯ 102 235 ⎯ 295 4.5 ⎯ 31 47 ⎯ 59 6.0 ⎯ 23 40 ⎯ 50 2.0 ⎯ 68 160 ⎯ 200 4.5 ⎯ 20 32 ⎯ 40 6.0 ⎯ 16 27 ⎯ 34 Cx = 28 pF 2.0 ⎯ 700 2000 ⎯ 2500 Rx = 6 kΩ (VCC = 2 V) 4.5 ⎯ 250 400 ⎯ 500 Rx = 2 kΩ (VCC = 4.5 V, 6 V) 6.0 ⎯ 210 340 ⎯ 425 2.0 90 110 130 90 130 4.5 95 105 115 95 115 6.0 95 105 115 95 115 2.0 0.9 1.0 1.2 0.9 1.2 4.5 0.9 1.0 1.1 0.9 1.1 6.0 0.9 1.0 1.1 0.9 1.1 ⎯ ⎯ ⎯ tpHL Propagation delay time tpLH ( CLR -Q, Q ) tpHL Output pulse width Typ. tTHL tpLH ( CLR TRIGGER-Q, Q) Min tTLH Propagation delay time twOUT ⎯ Cx = 0.01 μF Rx = 10 kΩ Cx = 0.1 μF Rx = 10 kΩ Output pulse width error between circuits Ta = −40 to 85°C VCC (V) Unit ns ns ns ns ns μs ms ΔtwOUT ⎯ ⎯ ±1 ⎯ ⎯ ⎯ % Input capacitance CIN ⎯ ⎯ 5 10 ⎯ 10 pF Power dissipation capacitance CPD ⎯ ⎯ 162 ⎯ ⎯ ⎯ pF (in same package ) Note: (Note) 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) = CPD･VCC･fIN + ICC’･duty/100 + ICC/2 (per circuit) (ICC’: active supply current) (duty. %) 9 2007-10-01 TC74HC123AP/AF/AFN Output Pulse Width Constant K – Supply Voltage (typical) tWOUT – Cx Characteristics (typ.) trr – VCC Characteristics (typ.) 10 2007-10-01 TC74HC123AP/AF/AFN Package Dimensions Weight: 1.00 g (typ.) 11 2007-10-01 TC74HC123AP/AF/AFN Package Dimensions Weight: 0.18 g (typ.) 12 2007-10-01 TC74HC123AP/AF/AFN Package Dimensions (Note) Note: This package is not available in Japan. Weight: 0.13 g (typ.) 13 2007-10-01 TC74HC123AP/AF/AFN RESTRICTIONS ON PRODUCT USE 20070701-EN GENERAL • The information contained herein is subject to change without notice. • 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. 14 2007-10-01