Electronic Components Datasheet Search |
|
CDP1851 Datasheet(PDF) 3 Page - Intersil Corporation |
|
CDP1851 Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 14 page 4-7 Functional Description The CDP1851 has four modes of operation: input, output, bidirectional, and bit-programmable. Port A is programmable in all modes; port B is programmable in all but the bidirectional mode. A control byte must be loaded into the control register to program the ports. In the input and output modes, each port has two handshaking signals, STROBE and RDY. In the bidirectional mode, port A has four handshaking signals: A RDY and A STROBE for input, B RDY and B STROBE for output. If port A is programmed in the bidirectional mode, port B must be programmed in the bit-programmable mode. Each terminal of port A or B may be individually programmed for input or output in the bit- programmable mode. Since handshaking is not used in this mode, the RDY and STROBE lines may also be used for bit- programming if port A is not in the bidirectional mode. Input Mode When a peripheral device has data to input, it sends a STROBE pulse to the PlO. The leading edge of this pulse clears the RDY line, inhibiting further transmission from the peripheral. The trailing edge of the STROBE pulse latches the data into the PlO buffer register and also activates the INT line to signal the CPU to read this data. The lNT pin can be wired to the INT pin of the CPU or the EF lines for polling. The CPU Static Electrical Specifications At TA = -40oC to +85oC, VDD 5%, Unless Otherwise Specified PARAMETER CONDITIONS LIMITS UNITS VO (V) VIN (V) VDD (V) CDP1851 CDP1851C MIN (NOTE1) TYP MAX MIN (NOTE1) TYP MAX Quiescent Device Current IDD - 0, 5 5 - 0.01 50 - 0.02 200 µA - 0, 10 10 - 1 200 - - - µA Output Low Drive (Sink) Current IOL 0.4 0, 5 5 1.6 3.2 - 1.6 3.2 - mA 0.5 0, 10 10 2.6 5.2 - - - - mA Output High Drive (Source) Current IOH 4.6 0, 5 5 -1.15 -2.3 - -1.15 -2.3 - mA 9.5 0, 10 10 -2.6 -5.2 - - - - mA Output Voltage Low-Level (Note 2) VOL - 0, 5 5 - 0 0.1 - 0 0.1 V - 0, 10 10 - 0 0.1 - - - V Output Voltage High Level (Note 2) VOH - 0, 5 5 4.9 5 - 4.9 5 - V - 0, 10 10 9.9 10 - - - - V Input Low Voltage VIL 0.5, 4.5 - 5 - - 1.5 - - 1.5 V 0.5, 9.5 - 10 - - 3 --- V Input High Voltage VlH 0.5, 4.5 - 5 3.5 - - 3.5 - - V 0.5, 9.5 - 10 7 -- --- V Input Leakage Current IlN Any Input 0, 5 5 - - ±1- - ±1 µA 0, 10 10 - - ±2 --- µA Three-State Output Leakage Current IOUT 0, 5 0, 5 5 - - ±1- - ±1 µA 0, 10 0, 10 10 - - ±1 --- µA Operating Current (Note 3) IDD1 - 0, 5 5 - 1.5 3 - 1.5 3 mA - 0, 10 10 - 6 12 - - - mA Input Capacitance CIN - - - - 5 7.5 - 5 7.5 pF Output Capacitance COUT - - - - 10 15 - 10 15 pF NOTES: 1. Typical values are for TA = 25 oC and nominal V DD. 2. IOL = IOH = 1µA 3. Operating current is measured at 200kHz for VDD = 5V and 400kHz for VDD = 10V, with open output (worst-case frequencies for CDP1802A system operating at maximum speed of 3.2MHz). CDP1851, CDP1851C |
Similar Part No. - CDP1851 |
|
Similar Description - CDP1851 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |