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P87C748EBPN Datasheet(PDF) 6 Page - NXP Semiconductors |
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P87C748EBPN Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 18 page Philips Semiconductors Preliminary specification 83C748/87C748 80C51 8-bit microcontroller family 2K/64 OTP/ROM, low pin count 1999 Apr 15 6 AC ELECTRICAL CHARACTERISTICS Tamb = 0°C to +70°C, VCC = 5V ±10%, VSS = 0V1, 2 16MHz CLOCK VARIABLE CLOCK SYMBOL PARAMETER MIN MAX MIN MAX UNIT 1/tCLCL Oscillator frequency: 3.5 12 MHz 3.5 16 MHz External Clock (Figure 1) tCHCX High time 20 20 ns tCLCX Low time 20 20 ns tCLCH Rise time 20 20 ns tCHCL Fall time 20 20 ns NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted. 2. Load capacitance for ports = 80pF. EXPLANATION OF THE AC SYMBOLS Each timing symbol has five characters. The first character is always ‘t’ (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designations are: C – Clock D – Input data H – Logic level high L – Logic level low Q – Output data T – Time V – Valid X – No longer a valid logic level Z – Float tCHCL tCLCL tCLCH tCHCX VCC –0.5 0.45V 0.2 VCC + 0.9 0.2 VCC – 0.1 tCLCX SU00297 Figure 1. External Clock Drive ROM CODE SUBMISSION When submitting ROM code for the 83C748, the following must be specified: 1. 2k byte user ROM data ADDRESS CONTENT BIT(S) COMMENT 0000H to 07FFH DATA 7:0 User ROM Data |
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