Read: 257 times
|#183719 - Alas, "weak output drive" and no input hysterese|
Responding to: Jan Waclawek's previous message
"The NTB0104 is a 4-bit, dual supply translating transceiver with auto direction sensing, that enables bidirectional voltage level translation."
The auto direction sensing part sounds interesting. If all I needed was just level shifting, then 74HCT can manage quite well, but these chips might be able to solve the data direction problem while still taking care of power dissipation for inadvertently loaded outputs, and the required noise immunity of a transceiver.
But there seems to be two issues.
1) There is no mention of any hysterese on inputs.
2) I'm not sure if they are strong enough for driving ribbon-cable signals.
"In a static state, the output drivers of the NTB0104 can maintain a defined
output level, but the output architecture is designed to be weak, so that
they can be overdriven by an external driver when data on the bus starts
flowing in the opposite direction."
So I see lots of potential for them - the price is nice too - but probably only for on-board level conversion.
From the datasheets it's a bit hard to figure out their actual drive capabilities, so I should probably get some samples to play around with, even if I do not think they are usable for this specific project.
|Bit-configurable transceiver chips||Per Westermark||09/12/11 02:28|
|Suggesting....again...||Michael Karas||09/12/11 05:35|
|Alas 5V needed and ribbon cables are a bit "rough"||Per Westermark||09/12/11 06:54|
|Another Suggestion....||Michael Karas||09/12/11 05:59|
|level translator||Jan Waclawek||09/12/11 06:21|
|Alas, "weak output drive" and no input hysterese||Per Westermark||09/12/11 07:30|
|TI sn74gtl2010||Stefan KAnev||09/17/11 02:18|
|or NXP GTL2010,GTL2000||Stefan KAnev||09/19/11 01:24|
|looks promising||Richard Erlacher||09/21/11 22:29|
|NXP GTL20xx -> NVT20xx||Jan Waclawek||10/04/11 00:57|
|Need to read more to understand them||Per Westermark||09/20/11 02:04|
|looks like the cat's miauw||Erik Malund||09/21/11 07:45|
|NXP has ....||Erik Malund||09/12/11 13:28|
|I2C or SPI just can't get even close to the huge bandwidth||Per Westermark||09/12/11 14:01|
|nope, no I²C clocks||Erik Malund||09/12/11 14:21|
|extender, not expander||Per Westermark||09/12/11 14:37|
|I have been wondering this myself||Justin Fontes||09/12/11 16:18|
|Supported capacitance seems to be the snag||Per Westermark||09/12/11 17:23|
|Differential SPI||Jez Smith||09/16/11 09:39|
|Serial -> buffers on adapter boards is a potential solution||Per Westermark||09/16/11 14:41|
|Have you considered programmable logic?||Richard Erlacher||09/19/11 14:08|
|I had suggested this as well||Michael Karas||09/19/11 14:33|
|Yes ... I remember that ...||Richard Erlacher||09/19/11 23:43|
|Long life||Per Westermark||09/20/11 01:59|
|They seem to live a long time ...||Richard Erlacher||09/20/11 09:22|
|Adapters||Per Westermark||09/20/11 10:16|
|These aren't necessarily so "huge"||Richard Erlacher||09/20/11 19:52|
|Not huge in size||Per Westermark||09/21/11 01:49|
|Some of them can handle that.||Richard Erlacher||09/21/11 22:34|
|Yes and no||Per Westermark||09/22/11 04:53|
|There are ways ...||Richard Erlacher||09/22/11 10:55|
|Body diodes||Per Westermark||09/22/11 16:39|
|serial termination ...||Erik Malund||09/23/11 07:36|
|Yes, current- and bandwidth-limiting components used||Per Westermark||09/23/11 08:25|
|you youing whippersnappers, pay attention||Erik Malund||09/23/11 11:45|
|pedantry, again||Andy Peters||09/20/11 11:13|
|What would YOU suggest?||Richard Erlacher||09/20/11 19:45|
|Here's a thought ...||Richard Erlacher||10/17/11 03:03|
|Probably||Per Westermark||10/17/11 15:51|
|I'd sugest you consider older CPLD's||Richard Erlacher||10/17/11 19:14|