Datenblatt-Suchmaschine für elektronische Bauteile |
|
ADM9264ARN-REEL Datenblatt(PDF) 5 Page - Analog Devices |
|
ADM9264ARN-REEL Datenblatt(HTML) 5 Page - Analog Devices |
5 / 12 page ADM9264 –5– REV. 0 CIRCUIT INFORMATION Monitor Inputs SU1 to SU4 The ADM9624 is provided with four analog inputs, SU1 to SU4, to monitor supply voltages of +12 V, +5 V, +3.3 V and +2.8 V. Each input is connected to a window comparator con- sisting of a pair of voltage comparators and a two-input NOR gate. Each pair of comparators obtains a reference voltage from a precision internal reference, and each input to be monitored is connected to the comparators via a precision, thin film attenuator, whose resistor ratios determine the trip points of each comparator. As the input voltages are attenu- ated before reaching the comparators, they may exceed the supply voltage of the ADM9264 without exceeding the com- mon-mode or differential input range of the comparators. When the input voltage is within limits, the outputs of both comparators are low, so the output of the NOR gate is high. If the voltage on the inverting input of the low comparator falls below the reference voltage, or the voltage on the noninverting input of the high comparator rises above the reference voltage, the output of the NOR gate will go low. Error Outputs Error outputs ERR1 to ERR4 are open-drain outputs that are OFF (high) when the corresponding input voltage is within limits and ON (low) when the input is out of limit. Each error output requires a 10 k Ω pull-up resistor to a positive supply, which may be different from VCC if required. The open-drain construction allows two or more of these outputs to be wire- ANDed together if required. Auxiliary Inputs ERRX, ERRY ERRX and ERRY are TTL-compatible auxiliary inputs that allow external signals such as temperature alarms to be linked into the ADM9264. ERRX is active high and forces PWROK low when it is high. ERRY is active low and forces PWROK low when it is low. DIS Input The disable input, DIS, is a TTL-compatible input. It overrides all other inputs to the PWROK logic and forces PWROK high when it is high. SU4DET Input SU4DET is a TTL-compatible input that disables the ERR4 output, causing ERR4 to go high when SU4DET is high. This allows the SU4 input to be disabled easily for systems that do not have a 2.8 V supply. PWROK Output The PWROK output combines the four error outputs and the auxiliary inputs to give a common “Power OK” output. If the four error outputs are high, ERRX is low, ERRY is high and DIS is low then PWROK is high, otherwise PWROK is low. PWROK is an open-drain output and requires a 10K pull-up resistor to a positive supply, which may be different from VCC if required. A truth table for the PWROK output is following. Truth Table DIS ERRX ERRY ERR4 ERR3 ERR2 ERR1 PWROK 0 0 1 1111 1 0 X X XXX0 0 0 XXX X 0 X0 0 XXX 0 X X0 0 XX0 X X X 0 0 X 0 XXXX 0 0 1 X XXXX 0 1 X X XXXX 1 X = don’t care. Power Supply VCC The ADM9264 can be powered from any supply voltage between 2.5 V and 6 V. This includes any of the supply voltages apart from that connected to SU1, since this is greater than 6 V. The logic outputs are open-drain and take their output high level from the voltage connected to the pull-up resistor, so they are not dependent on the value of VCC. |
Ähnliche Teilenummer - ADM9264ARN-REEL |
|
Ähnliche Beschreibung - ADM9264ARN-REEL |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller 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 |