전자부품 데이터시트 검색엔진 |
|
74ABT657PW 데이터시트(PDF) 2 Page - NXP Semiconductors |
|
74ABT657PW 데이터시트(HTML) 2 Page - NXP Semiconductors |
2 / 11 page Philips Semiconductors Product specification 74ABT657 Octal transceiver with parity generator/checker (3-State) 2 1995 Dec 11 853–1615 16106 FEATURES • Combinational functions in one package • Low static and dynamic power dissipation with high speed and high output drive • Output capability: +64mA/–32mA • Power-up 3-State • Latch-up protection exceeds 500mA per Jedec Std 17 • ESD protection exceeds 2000 V per MIL STD 883 Method 3015 and 200 V per Machine Model DESCRIPTION The 74ABT657 high-performance BiCMOS device combines low static and dynamic power dissipation with high speed and high output drive. The 74ABT657 is an octal transceiver featuring non-inverting buffers with 3-State outputs and an 8-bit parity generator/checker, and is intended for bus-oriented applications. The buffers have a guaranteed current sinking capability of 64mA. The Transmit/Receive (T/R) input determines the direction of the data flow through the bidirectional transceivers. Transmit (active-High) enables data from A ports to B ports; Receive (active-Low) enables data from B ports to A ports. The Output Enable (OE) input disables both the A and B ports by placing them in a high impedance condition when the OE input is High. The parity select (ODD/EVEN) input gives the user the option of odd or even parity systems. The parity (PARITY) pin is an output from the generator/checker when transmitting from the port A to B (T/R = High) and an input when receiving from port B to A port (T/R = Low). When transmitting (T/R = High) the parity select (ODD/EVEN) input is set, then the A port data is polled to determine the number of High bits. The parity (PARITY) output then goes to the logic state determined by the parity select (ODD/EVEN) setting and by the number of High bits on port A. For example, if the parity select (ODD/EVEN) is set Low (even parity), and the number of High bits on port A is odd, then the parity (PARITY) output will be High, transmitting even parity. If the number of High bits on port A is even, then the parity (PARITY) output will be Low, keeping even parity. When in receive mode (T/R = Low) the B port is polled to determine the number of High bits. If parity select (ODD/EVEN) is Low (even parity) and the number of Highs on port B is: (1) odd and the parity (PARITY) input is High, then ERROR will be High, signifying no error. (2) even and the parity (PARITY) input is High, then ERROR will be asserted Low, indicating an error. QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS Tamb = 25°C; GND = 0V TYPICAL UNIT tPLH tPHL Propagation delay An to Bn or Bn to An CL = 50pF; VCC = 5V 3.3 ns CIN Input capacitance VI = 0V or VCC 4 pF CI/O I/O capacitance Outputs disabled; VO = 0V or VCC 7 pF ICCZ Total supply current Outputs disabled; VCC =5.5V 500 nA ORDERING INFORMATION PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER 24-Pin Plastic DIP –40 °C to +85°C 74ABT657 N 74ABT657 N SOT222-1 24-Pin plastic SO –40 °C to +85°C 74ABT657 D 74ABT657 D SOT137-1 24-Pin Plastic SSOP Type II –40 °C to +85°C 74ABT657 DB 74ABT657 DB SOT340-1 24-Pin Plastic TSSOP Type I –40 °C to +85°C 74ABT657 PW 74ABT657PW DH SOT355-1 PIN CONFIGURATION 24 23 22 21 20 19 18 17 16 15 14 13 12 10 11 9 8 7 6 5 4 3 2 1OE ERROR ODD/EVEN T/R B0 B1 B2 B3 B4 B5 B6 B7 A0 A1 A2 A3 A4 VCC A5 A6 A7 PARITY GND GND SA00181 TOP VIEW PIN DESCRIPTION SYMBOL PIN NUMBER NAME AND FUNCTION 13 PARITY Parity output 11 ODD/EVEN Parity select input 12 ERROR Error output 1 T/R Transmit/receive input 2, 3, 4, 5, 6, 8, 9, 10 A0 - A7 A port 3-State outputs 23, 22, 21, 20, 17, 16, 15, 14 B0 - B7 B port 3-State outputs 24 OE Output enable input (active-Low) 18, 19 GND Ground (0V) 7 VCC Positive supply voltage |
유사한 부품 번호 - 74ABT657PW |
|
유사한 설명 - 74ABT657PW |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |