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74HC237 Datasheet(PDF) 7 Page - NXP Semiconductors |
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74HC237 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 17 page 74HC237 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 4 — 10 January 2011 7 of 17 NXP Semiconductors 74HC237 3-to-8 line decoder, demultiplexer with address latches [1] tpd is the same as tPLH and tPHL. [2] tt is the same as tTHL and tTLH. [3] CPD is used to determine the dynamic power dissipation (PD in W). PD =CPD VCC2 fi N+ (CL VCC2 fo) where: fi = input frequency in MHz; fo = output frequency in MHz; CL = output load capacitance in pF; VCC = supply voltage in V; N = number of inputs switching; (C L VCC 2 f o) = sum of outputs. 11. Waveforms tW pulse width LE HIGH; see Figure 9 VCC = 2.0 V 50 11 - 65 - 75 - ns VCC = 4.5 V 10 4 - 13 - 15 - ns VCC = 6.0 V 9 3 - 11 - 13 - ns tsu set-up time An to LE; see Figure 9 VCC = 2.0 V 50 6 - 65 - 75 - ns VCC = 4.5 V 10 2 - 13 - 15 - ns VCC = 6.0 V 9 2 - 11 - 13 - ns th hold time An to LE; see Figure 9 - VCC = 2.0 V 30 3 - 40 - 45 - ns VCC = 4.5 V 6 1 - 8 - 9 - ns VCC = 6.0 V 5 1 - 7 - 8 - ns CPD power dissipation capacitance CL =50pF;f= 1 MHz; VI =GND to VCC [3] -60 - - - - - pF Table 7. Dynamic characteristics …continued Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 10. Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to +85 C Tamb = 40 C to +125 C Unit Min Typ Max Min Max Min Max Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 7. Propagation delay input (An) and enable inputs (E2, LE) to output (Yn) and output transition time 001aab873 An, E2, LE input Yn output VM tPHL tTHL tTLH tPLH VM |
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