INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC • The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC HEF4508B MSI Dual 4-bit latch Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification HEF4508B MSI Dual 4-bit latch data into the latch. A HIGH on the reset line forces the outputs to a LOW level regardless of the state of the ST input. The 3-state outputs are controlled by the output-enable input. A HIGH on EO causes the outputs to assume a high impedance OFF-state regardless of other input conditions. This allows the outputs to interface directly with bus orientated systems. When EO is LOW the contents of the latches are available at the outputs. DESCRIPTION The HEF4508B is a dual 4-bit latch, which consists of two identical independent 4-bit latches with separate strobe (ST), master reset (MR), output-enable input (EO) and 3-state outputs (O). With the ST input in the HIGH state, the data on the D inputs appear at the corresponding outputs provided EO is LOW. Changing the ST input to the LOW state locks the Fig.1 Functional diagram. FAMILY DATA, IDD LIMITS category MSI See Family Specifications January 1995 2 Philips Semiconductors Product specification HEF4508B MSI Dual 4-bit latch Fig.2 Pinning diagram. HEF4508BP(N): 24-lead DIL; plastic (SOT101-1) HEF4508BD(F): 24-lead DIL; ceramic (cerdip) (SOT94) HEF4508BT(D): 24-lead SO; plastic (SOT137-1) ( ): Package Designator North America PINNING D0A to D3A, D0B to D3B data inputs STA , STB strobe inputs MRA, MRB master reset inputs EOA, EOB output enable inputs O0A to O3A, O0B to O3B 3-state outputs FUNCTION TABLE INPUTS OUTPUT MR ST EO Dn On L H L H H L H L L L L L L X latched H X L X L X X H X Z Notes 1. H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial Z = high impedance OFF state January 1995 3 Philips Semiconductors Product specification HEF4508B MSI Dual 4-bit latch Fig.3 Logic diagram (one 4-bit latch). January 1995 4 Philips Semiconductors Product specification HEF4508B MSI Dual 4-bit latch AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns; see also waveforms Fig.4. VDD V SYMBOL MIN. TYP. TYPICAL EXTRAPOLATION FORMULA MAX. Propagation delays ST → On HIGH to LOW 5 10 tPHL 15 5 LOW to HIGH 10 tPLH 15 Dn → On HIGH to LOW 5 10 tPHL 15 HIGH to LOW Output transition times HIGH to LOW LOW to HIGH ns 88 ns + (0,55 ns/pF) CL 100 ns 39 ns + (0,23 ns/pF) CL 35 70 ns 27 ns + (0,16 ns/pF) CL 115 230 ns 88 ns + (0,55 ns/pF) CL 50 100 ns 39 ns + (0,23 ns/pF) CL 35 70 ns 27 ns + (0,16 ns/pF) CL 95 190 ns 68 ns + (0,55 ns/pF) CL 40 80 ns 29 ns + (0,23 ns/pF) CL 30 60 ns 22 ns + (0,16 ns/pF) CL 95 190 ns 68 ns + (0,55 ns/pF) CL 80 ns 29 ns + (0,23 ns/pF) CL 30 60 ns 22 ns + (0,16 ns/pF) CL 100 200 ns 73 ns + (0,55 ns/pF) CL 40 80 ns 29 ns + (0,23 ns/pF) CL 15 30 60 ns 22 ns + (0,16 ns/pF) CL 5 60 120 ns 10 ns + (1,0 ns/pF) CL 10 tPLH 15 MR → On 230 50 40 5 LOW to HIGH 115 5 10 tPHL 30 60 ns 9 ns + (0,42 ns/pF) CL 15 20 40 ns 6 ns + (0,28 ns/pF) CL 5 60 120 ns 10 tTHL 30 60 ns 9 ns + (0,42 ns/pF) CL 15 20 40 ns 6 ns + (0,28 ns/pF) CL 5 45 90 ns 10 tTLH 3-state propagation delays Output enable times EO → On HIGH LOW 10 tPZH 20 40 ns 15 18 36 ns 5 45 90 ns 10 tPZL 20 40 ns 15 18 36 ns 5 35 70 ns Output disable times EO → On HIGH LOW 10 tPHZ 20 40 ns 15 18 36 ns 5 45 90 ns 20 40 ns 18 36 ns 10 tPLZ 15 January 1995 10 ns + (1,0 ns/pF) CL 5 Philips Semiconductors Product specification HEF4508B MSI Dual 4-bit latch AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V Minimum ST pulse width; HIGH Minimum MR pulse width; HIGH Recovery time for MR SYMBOL 5 MIN. TYP. MAX. 50 25 ns 30 15 ns 15 20 10 ns 5 40 20 ns 10 10 tWSTH tWMRH 24 12 ns 15 20 10 ns 5 20 0 ns 10 tRMR 20 0 ns 15 15 0 ns Set-up times 5 35 10 ns Dn → ST 10 25 5 ns 15 20 0 ns Hold times 5 20 0 ns Dn → ST 10 20 0 ns 15 0 ns 15 VDD V Dynamic power 5 tsu thold see also waveforms Fig.4 TYPICAL FORMULA FOR P (µW) 2 000 fi + ∑ (foCL) × VDD2 where fi = input freq. (MHz) dissipation per 10 9 000 fi + ∑ (foCL) × package (P) 15 25 000 fi + ∑ (foCL) × VDD2 VDD2 fo = output freq. (MHz) CL = load capacitance (pF) ∑ (foCL) = sum of outputs VDD = supply voltage (V) January 1995 6 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... Philips Semiconductors Dual 4-bit latch January 1995 7 Product specification Waveforms showing minimum ST and MR pulse widths, set-up and hold times for Dn to ST, recovery time for MR and propagation delays from ST to On, to Dn to On and MR to On. HEF4508B MSI Fig.4 Philips Semiconductors Product specification HEF4508B MSI Dual 4-bit latch APPLICATION INFORMATION Some examples of application for the HEF4508B are: • Buffer storage • Holding registers • Data storage and multiplexing Fig.5 Example of a bus register using HEF4508B and HEF4015B. January 1995 8 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... Philips Semiconductors Dual 4-bit latch January 1995 9 Fig.6 Example of a dual multiplexed bus register with function select using two HEF4508B and one HEF4019B. FUNCTION SELECT FUNCTION L L inhibit (all L) H L select A bus L H select B bus H H A1 + B1 Product specification SB HEF4508B MSI SA